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How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR

Published by artem On
  • Date27.07.2020
2020 passed outside the window... Western Digital and Seagate are expanding their capacity with PMR (CMR)/TDMR ePMR and SMR technologies, simultaneously scaring off local onlookers with the two-headed How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMRSEAGATE Dual ActuatorSeagate MACH.2 and How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMRWDC Dual ActuatorWDC Dual Actuator , as well as the freshly caught ones: MAMR and HAMR. When, like Toshiba while remaining faithful to the PMR (CMR) traditions, it continues to build the Leaning Towers of Pisa, threatening to release drives cut by BPM and looking sideways at the neighboring zoos. Actually, if from the first lines it seemed to you that they are openly trying to offend you! Then I hasten to assure you that this is not so. It just says that it's time to figure it out, here and now!
*Financial information from Forbes site (Toshiba, Seagate и Western Digital). Date: 02/10/2020

Important points before choosing a hard drive

Choosing hard drive at the junction of new technological solutions is not easy task! And if you don't go into details when choosing future device, then in the future, you can get something completely different from what you expected. If you were satisfied with capabilities of the previous drive, then take Toshiba, this is the only manufacturer that until recently (2019) adhered to the traditional PMR (CMR) recording vector. If you want to try new SMR, PMR (CMR)/HelioSeal, SMR/TDMR, PMR (CMR)/TDMR, PMR (CMR)/HAMR or PMR (CMR)/MAMR, ePMR, then Western Digital or Seagate. It is also important to note that the price in the line of 2.5 inch drives does not affect the quality so much! Today, speed and capacity are important, and the external or internal cloud solves the tasks of backup. We look at reviews and the worst reviews, draw conclusions...

Manufacturer's warranty

Usually the manufacturer provides customers with a guarantee for period of 24 to 60 months. Large computer stores follow the same rules.

Backup

Even the coolest technology will not save you from marriage or force majeure. Personal cloud or cold backup is the best solution for such cases!

Smart choice

Choose hard drive model that suits your tasks and needs. Don't chase new speeds and capacity without due diligence!

Elements and skills in the magnetic recording universe

As in any other game, our card strategy also has its own rules and restrictions. Which must be observed or maneuvered to ensure a delicate balance of existing technologies and to develop future ones. Every major manufacturer has gone this way and, unfortunately, will go again and again.
W hile manufacturers decide what is best to produce «HDD vs SSD», we will try to focus on the issues that will influence the future development of the hard disk drive industry. There are III elements, in the universe of magnetic recording, by curbing each of them, you will be able to manage petabytes of information of your subjects and conquer new territories.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR


Signal-to-noise ratio

Need to reduce the number of magnetic grains per bit leads to more noise in their signal!
Advice: My lord, the ability to listen to disgruntled subjects from other kingdoms has helped you more than once to gain power over other people's possessions.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR


Recording head capabilities

The use of modern hard magnetic materials requires an appropriate magnetic field strength of the recording head.
Advice: Strong hand and well-delivered speech, loyal servants of the monarch!
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR


Thermal stability (superparamagnetic limit)

The smaller the size of the magnetic domain (grain), the more it will be influenced by the surrounding thermal energy. And the more difficult it will be for him to maintain his polarity!
Advice: Suppression of riots, on the newly occupied territories, it is your fundamental duties, sire!

Existing and possible types of magnetic recording technology

My lord! Before you touch these texts. I only dare to remind you that you have already held these outlandish mechanisms in your hands more than once. But if your lordship, due to the deepest immersion in the worries and labors of ruling the kingdom, lost sight of this, then this article will help you refresh your memory - the structure of modern hard disk.

  • Longitudinal magnetic recording (LMR)

    Description:  The magnetization vector for each bit of information (magnetic domain – cell) is parallel to the surface of the carrier. The arrows indicate the direction and polarity of the magnetic domains.

    Recording density: 2000 bit/inches2 – 100 Gbit/inches2

    Commercial life cycle: 1956 – 2006

    1988 – PrairieTek 220 – first 2.5 inch HDD

    1991 – IBM 0663 “Corsair” – first 3.5 inch HDD

    1991 – Integral Peripherals 1820 “Mustang” – first 1.8 inch HDD

    1992 – HP 3013/3014 “Kittyhawk” – first 1.3 inch HDD

    2004 – Toshiba MK2001MTN – first 0.85 inch HDD

    Applicable types of magnetic reading heads (Reader sensor)

    1972 – 1990 – Use of composite ferrite heads with the addition of one or more intermediate layers consisting of an alloy of various metals (MIG – Metal-in-gap heads) (Seagate ST-225)

    1979 – 1995 – Use of thin-film materials in the manufacture of heads (TF – Thin film heads) (IBM 3370)

    1990 – 1997 – Using reading heads based on the effect of anisotropic magnetoresistance (AMR – Anisotropic magnetoresistive heads) (IBM 9345 “Sawmill”)

    1997 – 2012 – Using reading heads based on the effect of giant magnetoresistance (GMR – giant magnetoresistive heads) (IBM Deskstar 16GP “Titan”)

    2004 – present – Using reading heads based on the effect of tunneling magnetoresistance (TMR – Tunnel magnetoresistance heads) (Seagate Momentus II)

     

     

  • Perpendicular magnetic recording (PMR) or conventional magnetic recording (CMR)

    Description:  The magnetization vector for each bit of information (magnetic domain – cell) is located perpendicular to the surface of the carrier. The magnetization of the working layer (hard magnetic layer or perpendicular thin-film medium) is carried out using an orienting sublayer (soft magnetic underlayer). As well as intermediate / exchange (Exchange spring media) layers «Intermediate layer» and «Seed layer». The arrows indicate the direction and polarity of the magnetic domains.

    Recording density: 130 Gbit/inches2 – 1.14 Tbit/inches2 (Showa Denko 2020 г.)

    Commercial life cycle: 2005 – present

    2005 – Toshiba MK4007GAL – first PMR / CMR hard drive

    Applicable types of magnetic reading heads (Reader sensor)

    1997 – 2012 – Using reading heads based on the effect of giant magnetoresistance (GMR – giant magnetoresistive heads) (IBM Deskstar 16GP “Titan”)

    2004 – present – Using reading heads based on the effect of tunneling magnetoresistance (TMR – Tunnel magnetoresistance heads) (Seagate Momentus II)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Shingled magnetic recording (SMR)

    Description: SMR recording technology is based on the principles of PMR (CMR). But unlike it, previously recorded blocks in pmr zones (used as a cache) are distributed between special smr zones (bands – several tracks recorded at a time with an overlay of 5-10%). Thus, increasing the recording density, which ultimately leads to an increase in the capacity of the used storage space by 15-20%. But due to the limited size of the buffer zone (pmr zones) and lazy writes, it can lead to significant drawdowns and loss of performance.

    Recording density: 1 Tbit/inches2  – 1203 Gbit/inches2 (Seagate Barracuda manual 2017 г.)

    Commercial life cycle: 2013 – present.

    2013 – Seagate Desktop HDD ST4000DM001/ST5000DM000 – first SMR hard drives

    Applicable types of magnetic reading heads (Reader sensor)

    2004 – present – Using reading heads based on the effect of tunneling magnetoresistance (TMR – Tunnel magnetoresistance heads) (Seagate Momentus II)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Dimensional + Perpendicular Magnetic Recording (TDMR+PMR)

    Description:  This technology implies the use of several TMR reading heads (2 or 3) located on one slider to improve the signal-to-noise ratio (SNR) when reading previously recorded tracks (tracks), reading one track at a time. This arrangement of reading elements made it possible to reduce the distance between the tracks and increase the overall density by 6-20% (in a certain area of the plate) when using the PMR (CMR) technology.

    Recording density: 1077 Gbit/inches2 (when using 9th generation plates 1.5TB – 923 Gbit/inches2)

    Commercial life cycle: 2017 – present

    2017 – Seagate IronWolf, IronWolf Pro, Barracuda Pro – first hard drives with TDMR heads

    Applicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Two-Dimensional + Shingled Magnetic Recording (TDMR+SMR)

    Description: The original design of TDMR was to provide more stability for SMR drives. Since the use of multiple TDMR heads improved the signal-to-noise ratio (SNR) and would improve the reading of the already compressed smr zones on the drive. Has no commercial realization!

    Recording density: N/A

    Commercial life cycle: N/A

     

    Applicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Microwave-Assisted Magnetic Recording (MAMR)

    Description: In basis of the MAMR technology is a kind of Spin-Torque Oscillator that emits microwaves in the immediate vicinity of a smaller recording head (compared to the traditional one). The resulting resonance amplifies the magnetic field of the head. Therefore, a field of higher intensity is formed, which allows recording on materials with a high coercive force (having a higher threshold before reaching the superparamagnetic effect). The use of this type of writing heads and materials allows to reduce the size of the recorded tracks, thereby increasing the density and therefore the volume of the contained information. This in turn will require the use of more sensitive read heads, like TDMR. Has no commercial implementation!

    Recording density: until 4 Tbit/inches2

    Commercial life cycle: N/A

    Applicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Thermomagnetic recording – Heat-assisted Magnetic Recording (HAMR)

    Description: Hybrid HAMR technology used a combined write head with laser. Which irradiates the recording area of the plate through a Near Field optical transducer (NFT). The main component of which is a plasmonic antenna made of gold. This technology requires a significant change in the materials and structure used in the manufacture of PMR plates and sliders (read / write heads). This allows you to significantly increase the recording density. Has no commercial implementation!

    Recording density: until 6 Tbit/inches2

    Commercial life cycle: N/A

    Aplicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Energy-Enhanced Perpendicular Magnetic Recording (ePMR)

    Description: Hybrid ePMR technology implies the use of combined recording head with some kind of energy source (like STO in MAMR), which makes it possible to use materials with high coercive force, that is, having a higher threshold before reaching the superparamagnetic effect. Together with used technology TDMR allows to reduce the size of recorded tracks and the distance between them. By increasing the recording density, which, in turn, leads to an increase in the total capacity of the stored information.

    Recording density: 918-1022 Gbit/inches2 (Ultrastar DC HC550)

    Commercial life cycle: 2020 – present

    2020 – Western Digital Ultrastar DC HC550 – first hard drives with ePMR support

    Aplicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

  • Heat-assisted + Bit-Patterned Magnetic Recording (HAMR+BPMR=HDMR)

    Description: One of the most promising and difficult to implement technologies. Using nanolithography technology and self-assembled block copolymers on the surface of the plates, an array of “magnetic islands” of a cylindrical shape with a step of 4.5nm to 10nm. Each magnetic island (domain) is equal to 1 bit of information. This allows the PMR recording density to be increased to 1.3 Tbit/inches2, 1.9 Terabit/inches2 и 3.3 Terabit/inches2. Together with the use of read (TDMR) and write (HAMR) technologies, this figure is expected to be increased to 10 Tbit/inches2. Has no commercial realization!

    Recording density: until 10 Tbit/inches2

    Commercial life cycle: N/A

    Applicable types of magnetic reading heads (Reader sensor)

    2017 – present – Using two reading heads on slider, based on the effect of tunnel magnetoresistance (TDMR – Two-Dimensional Tunnel magnetoresistance heads) (Barracuda Pro, IronWolf, IronWolf Pro)

Summary table of applied technologies

My lord, our guild of supreme archmages managed to translate the most important chronicles of travelers who arrived from the eastern worlds - Showa Denko (SDK) Generation PMR (CMR)
wdt_ID Generation 2.5-inch Years 3.5-inch Years
1 1 80GB 160GB
2 2 120GB 250GB
3 3 160GB 2007 334GB 2007
4 4 250GB 2008 500GB 2008
5 5 334GB 2009 750GB 2009
6 6 500GB 2011 1TB 2010 ～2011
7 7 670GB 2013 1.1～1.3TB 2014
8 8 750GB 2015 1.3～1.5TB 2015
9 9 1TB 2017 1.5～1.8TB 2017
10 10 - - 2TB 2019
On them it will be easier for you to navigate the mechanisms and technologies with which your lordship could strengthen the army and the borders of your kingdom. This table shows the most significant events and achievements of neighboring kingdoms and countries that have made improvements.
wdt_ID Technology Announced growth Maximum Density Plate Density Date of taken | Source Estimated Limit
1 TMR + PMR(CMR) ≈ 10% 1.14 Tbit/inches2 2TB 2019 | SDK & Toshiba N/A
2 TMR + SMR ≈ 25% 1203 Gbit/inches2 2TB 2017 | Seagate SMR N/A
3 TDMR + PMR(CMR) ≈ 6～20% 1058 Gbit/inches2 1.75TB 2019 | Seagate TDMR N/A
4 TDMR + ePMR N/A 1022 Gbit/inches2 2TB 2020 | Western Digital ePMR N/A
5 TDMR + MAMR N/A N/A N/A N/A 4 Tbit/inches2
6 TDMR + HAMR + PMR(CMR) ≈ 50% 2381 Gbit/inches2 3TB 2020 | Seagate HAMR 6 Tbit/inches2
7 HDMR (TDMR + HAMR + BPMR) N/A N/A N/A N/A 5～10 Tbit/inches2
8 TMR + BPMR N/A N/A N/A N/A 3 Tbit/inches2

My lord, it's time to act!

N ow that you have learned the secrets of these mechanisms and technologies that came with the chronicles of your subjects and servants who completed expeditions in the far-off worlds. It's time to replenish your ammunition and the ranks of your troops with new servants who will unquestioningly follow your orders and defend any ambitions, My lord.

The tables show hard drives and network storages released from 2017 - 2020 Information was collected from various sources: manufacturer's websites, reviews and tests, forums and our observations. This approach in collecting information is not accurate, but allows us to register the appearance of new models, or vice versa. This can be evidenced by the variety of disks in the tables below.
If you have any objections or additions to the existing lists, please leave them in the comments. And remember, the most reliable source of information is you! Take care of yourself!

Toshiba

The following technologies are used in their hard drives:

How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
PWC with PLP
Persistent Write Cache technology with Power Loss Protection — cache buffer with power loss protection.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TDCT
Toshiba Dynamic Cache Technology — dynamic caching, which optimizes the read / write cache allocation in real time and thereby improves performance.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TCPT
Toshiba Stable Platter Technology — stabilizes the motor shaft at both ends, thereby increasing performance, durability, and scalability in NAS systems.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Security Levels SIE | SED | SED-FIPS
SIE (Sanitize Instant Erase — cleaning by instant destruction).
SED (Self-Encrypting Drive — self-encrypting disk).
SED-FIPS (FIPS certified self-encrypting drive).
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TSST with TC
Toshiba Silent Seek Technology with Temperature control - improves energy efficiency, and optimizes cooling.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Helium
Helium-filled hard disk drive — filling the hermozone with helium allows you to reduce the gap between the plates and increase their number.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TDMR
Two-dimensional Magnetic Recording.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
PMR/CMR
Conventional Magnetic Recording.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
SMR
Shingled Magnetic Recording.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
RV-Sensor
Rotational Vibration Sensors - stabilization of engine shaft rotation in disk arrays.

Toshiba 3.5 drives

Toshiba 2.5 drives

Toshiba Portable | External

Enterprise Toshiba drives

Seagate

The following technologies are used in their hard drives:

How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
PB | PC
Power Balance - provide energy savings and uninterrupted work.
Power Choice - providing control of consumed power according to T10 standard.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
AWC | TB | EC
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMRAdvanced Write CachingAdvanced Write Caching - improves random write performance through the use of non-volatile cache and mirrored memory DRAM
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMRTurbo BoostTurbo Boost - speeds up input/output operations and optimizes response times
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMREnhanced CachingEnhanced Caching = Advanced Write Caching + Turbo Boost
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
MACH.2 Multi Actuator
MACH.2 Multi Actuator -doubles the number of input-output operations per second on a single hard disk by using two independent drives simultaneously transmitting data to the host computer.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Seagate Secure ISE | SED | SED-FIPS
ISE (Instant Secure Erase — cleaning by instant destruction)
SED (Self-Encrypting Drive — self-encrypting disk)
SED-FIPS (FIPS certified)
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Hyperscale
Hyperscale — hyperscale SATA drives are designed to handle large amounts of data and deliver 20% more effective random writes.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Helium
Helium-filled hard disk drive — filling the hermozone with helium allows you to reduce the gap between the plates and increase their number.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TDMR
Two-dimensional Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
PMR/CMR
Conventional Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
SMR
Shingled Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
RV-Sensor
Rotational Vibration Sensors - stabilization of engine shaft rotation in disk arrays.

Seagate 3.5 drives

Seagate 2.5 drives

Seagate Portable | External

Enterprise Seagate drives

Western Digital

The following technologies are used in their hard drives:

How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
IP | IS
IntelliPower — optimizing caching algorithms to minimize performance losses from reduced spindle speed, which results in energy savings.
IntelliSeek — calculates the optimal time to search for information, thereby reducing power consumption and vibration, which adversely affect the longevity of drive.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
AF | AF4k
AllFrame — reduces the risk of interruptions during recording and the likelihood of loss or corruption of frames during continuous uninterrupted operation.
AllFrame 4k — optimizes streaming data to prevent dropped video frames through special buffer management policy.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
ST
StableTrac — the spindle motor is fixed inside the drive on both sides to reduce the influence of vibration and more accurate positioning of the head unit during reading / writing.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Security Levels SIE | SED | SED-FIPS
SIE (Sanitize Instant Erase —cleaning by instant destruction)
SED (Self-Encrypting Drive — self-encrypting disk)
SED-FIPS (FIPS certified self-encrypting drive)
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
HAMR
Heat-assisted Magnetic Recording (HAMR)
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Helium
HelioSeal — filling the hermozone with helium allows you to reduce the gap between the plates and increase their number.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
TDMR
Two-dimensional Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
PMR/CMR
Conventional Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
SMR
Shingled Magnetic Recording
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
ABP
3D Active Balance Plus — balancing technology in two planes, which reduces the influence of mutual vibration, allowing the rotation of the magnetic plates to stabilize and ensure accurate positioning of the head assembly.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
ePMR
Energy-Enhanced Perpendicular Magnetic Recording (ePMR)
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
RAFF
Rotary Acceleration Feed Forward (RAFF) - adaptive vibration compensation technology. Allows you to recognize the beginning of vibrations, develop an optimal trajectory of movement of the heads and ultimately avoid or at least reduce the drop in disk performance.
How to сhoose hard drive?! Introduction in magnetic recording technology that maybe you heard on PMR (CMR) and ePMR, SMR, HAMR and MAMR, TDMR and BPMR
Power Disable Feature
Power Disable Feature (PD) - disk cold boot management feature introduced with SATA 3.3 - February 2, 2016. In SATA drives, when using a non-server power supply before 2016, it may cause a cyclic reboot.
MC | MCP
Media Cache - increases the performance of random writing by using certain areas of the surface of the plates, as buffer zones. Media Cache Plus = Media Cache + nonvolatile memory (NVC) -

Western Digital 3.5 drives

Western Digital 2.5 drives

Western Digital | External

Enterprise Western Digital drives