this post was submitted on 03 Jun 2024
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Been finding some good deals on 2.5 disks lately, but have never bought one before. Have a couple of 3.5 disks on the other hand in my Unraid server. Wondering how much it matters wether I get a 2.5 or not? What form factor do you prefer/usually go for?

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[–] [email protected] 20 points 6 months ago (14 children)

2.5" disks are SMR, you don't want that in a raid.

[–] [email protected] 9 points 6 months ago (6 children)
[–] [email protected] 15 points 6 months ago (4 children)

SMR is a relatively new disk format technology that makes drives cheaper but writes slower, which can be noticeably bad in a NAS, especially if you are using a write-intensive RAID type. Most disk manufacturers will have drives meant for NAS like WD Red or Seagate Ironwolf, and they are almost all CMR and not SMR.

[–] ultimitchow 7 points 6 months ago

i have had SMR drives slow to about 2MB/s with sustained sequential writes. "noticeably bad" really undersells how terrible they are.

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