Is WD Red Pro SMR or CMR?

Which WD hard drives are SMR?

The Western Digital Drives with SMR are:

  • WD Red 2TB – 5,400rpm – SATA 6GB/s – WD20EFAX.
  • WD Red 4TB – 5,400rpm – SATA 6GB/s – WD40EFAX.
  • WD Red 6TB – 5,400rpm – SATA 6GB/s – WD60EFAX.
  • WD Red 8TB – 5,400rpm – SATA 6GB/s – WD80EFAX.
  • WD Blue 2TB – 3.5” – WD20EZAZ.
  • WD Blue 6TB – 3.5” – WD60EZAZ.
  • WD Blue 1TB – 2.5” – WD10SPZX.

What is WD Red used for?

Packed with power to handle the small- to medium-sized business NAS environments and increased workloads for SOHO customers, WD Red Plus is ideal for archiving and sharing, as well as RAID array rebuilding on systems using ZFS and other file systems.

Are WD Red Pro CMR?

Both NAS (Network Attached Storage) drives—Seagate’s Ironwolf Pro and Western Digital’s Red Pro—are CMR drives and not the more performance-problematic SMR technology.

What does CMR stand for?


Acronym Definition
CMR Cardiovascular Magnetic Resonance (also seen as CVMR)
CMR Code of Massachusetts Regulations
CMR Complete Molecular Response
CMR Common Mode Rejection

Is WD Blue CMR or SMR?

Western Digital released a statement showing which drives from their HDDs series use the slower SMR technology and which ones make use of the faster CMR technology. Drive series featuring SMR include the WD Red and WD Blue HDD series, both of which come in a 3.5″ form factor.

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Is WD Red SMR?

Re-organizing their Red portfolio, the vanilla WD Red family has become a pure SMR lineup. Meanwhile a new brand, the Red Plus, will encompass the 5400 RPM CMR hard drives that the WD Red brand was previously known for.

How do I know if my WD is SMR?

The easiest way to detect whether it is a SMR drive is the cache size. Old drives (WDx0EFRX) had 64MB cache whereas new replaced drives (WDx0EFAX) feature 256MB. You can also read the serial number on the disk itself and compare it to a table bellow.

Is WD Blue 4TB SMR or CMR?

List of WD CMR and SMR hard drives (HDD)

Model Series Capacity