Fixed drive letter external disk

[PoolBoy]

I've  a drive cradle/hub (don't even know what they are called) connected to USB.
I can plug a 3.25" or 2.5" HDD without casing in them.

I use it as part of my backup regime. Every week I plug in another disk, make a backup and store it off-site.
That works fine but my Backup software wants to know where the backup disk is. Windows just seems to assign a random letter so I've to point my software to that letter each time.

Is there  away to assign a fixed letter to that cradle/hub?
Perhaps even when it's empty like a DVD drive.

Windows see the plugged in HDD as fixed disks.

[Shane]

If you're rotating a set of drives (e.g. maybe you've got 4 backup drives, one for each week of the month) then normally Windows should assign the same letter to a given drive once it re-encounters it in the rotation (unless for some reason that letter is already in use - or was in use but Windows decided for whatever reason that it won't free the letter). You may need to manually assign each drive the letter via Windows Disk Management (pick one that is unlikely to be used by other drives connected at the same time, e.g. if your usual drives occupy "C" to "K", pick "U") before this will stick.

If it's always a brand new drive that you're using in the cradle* then normally Windows will assign the first free letter it has available to it (e.g. if you have drives C, D, E and plug it in it should get F) but if that's not happening (because Windows) and you don't want to do it manually then you'd need a program/script that assigns a letter or path based on the cradle's port number or device ID or similar fixed identifier.

... and I've just found this program: https://www.uwe-sieber.de/usbdlm_e.html which may be what you're looking for, I haven't tried it myself.

*(I've also seen it called a dock or caddy, or hub if it can take multiple drives)

[PoolBoy]

Gonna try the tool. Thanks!