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Comment by roseway4 | Hacker News Reader

I went looking for 2.5 inch NAS/ video recorder drives this past weekend and came up empty handed. I’d hoped to install them into a mini-pc NVR. The form-factor doesn’t appear to lend itself to the reliability drive manufacturers target for this class of drive. They’re optimized for high write speeds and very high write loads. You can of course use consumer laptop drives in a NAS, but write speeds will be lower and reliability may suffer.

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> speeds will be lower and reliability may suffer

1Gbps is the max. anyways for my home setup, no matter how fast the drive is and I have a backup for important stuff, I'm not dependent on enterprise NAS drives.

I want: extremely small, low cost and very low watt usage.

The main issue is that larger capacity drives (> 2TB) seem to be SMR in the 2.5" range. I've looked and haven't found a PMR one (except maybe for "enterprise" drives which cost more than an SSD). Depending on how you want to use those drives, you may be having a bad time. For example when rebuilding a ZFS pool. [0]

If your use case / setup allow you to deal with the complete loss of your array (which, granted, is not 100% likely) or don't use ZFS, then I suppose you could look at Seagate's 2.5 Barracuda line. They're relatively cheap given their capacity and I don't think they're particularly unreliable in and of themselves.

[0] There are many people talking on the internet about ZFS performance with SMR disks. Here's a quick find:

https://arstechnica.com/gadgets/2020/06/western-digitals-smr...

RAID-Z2 on 4x2TB 2.5 inch HDD (without SMR) on a PI over 1 GbE sounds fine to me.

It's not super much space, but any two drives can fail, it's rather cheap and low powered + passive cooling should be possible.

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