Question SMR external drive question


Junior Member
Jun 15, 2023
newbie here , i have 4TB wd my book i believe its SMR drive inside , i read smr drive bad for write and good for read
but i want to use this drive as frequently backup (once a months , more or less 100gb every backup) will doing this over time will make the drive become unusable (write limit) ? or takes forever to write?

thanks in advance


Memory & Storage, Graphics Cards Mod Elite Member
Super Moderator
Sep 13, 2008
I personally think SMR HDDs are bad in general, and would stay away. They are too slow. I also don't trust 2.5 in HDDs, or in general pre-built external drives. I prefer to buy a quality desktop drive, and use a USB dock or external enclosure with it.

Also, another option for you, if you only need a couple TB of backup space, would be to buy a 2TB SSD and put it in an enclosure. Much faster. SSDs are getting much cheaper now.


Junior Member
Oct 29, 2016
SMR drives are 'write seldom' read often storage type drives.
They do have some non SMR space that transparently acts as a write cache for the drive, but not enough to write a large backup to.

When writing (even just 1 changed bit) to the drive it has to read the whole track/s into its RAM buffer, change the bit, and write all the data back.
That makes it especially slow for R4K I/O.
For a backup where it's one large compressed file; maybe not such a big issue because why bother to read the whole track if all the data's going to be changed anyway..?
Test and see.