Can not see USB drive

NTFS file systems don’t like it AT ALL when they are hot-uplugged. That’s why Windows has this:

The file system is now probably flagged as unsafely removed and ROCK refuses to mount it:

So, attach it to the Windows machine, start a command window as administrator, run chkdsk /f on the disk. Then remove it safely from Windows.

Note that Roon does not recommend NTFS for external USB disks connected to ROCK/Nucleus:

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