USB disk not unmounting

[stefangs]

hi all,

i have a bunch of USB disks connected to a Macintel with 10.5.8 via a hub. i only use these disks for backups, no apps or documents are accessed while working normally.

one of the disks refuses to unmount. i always get the message that it's in use and i should quit applications etc. all my permissions are repaired, i've rebooted (it's been going on for a while) disk utility does not complain about the disk and all other disks unmount fine.

what else can cause such behaviour?

thanks,
stefan

 

[Andeavor]

Have you unplugged them with the Mac off and then plug them back in after you reboot? I had a similar issue with an external drive via USB once that would not react until I did just that and after plugging it back in, it went back to normal behavior.

 

[stefangs]

i just tried this now and i was able to unmount. not having accessed the disk or more than a couple of apps, it looks like that did the trick. if so, it must be one of the strangest bugs i've seen! thanks for your help,
stefan