I have a couple of customers that have Arcserve and 5 USB ExtHDD's on rotation (WD Passport if it makes a differnce). They are setup fine on a File system device and the test runs, pre-flight checks and accessing the drive from windows is all fine.
When the backup runs at 23:00 it fails. Setup Windows NT backup at the same time and that also fails with the following errors:
Arcserve gives this error:
Unable to format media (MEDIA=THURSDAY, EC=COMMAND ABORTED)
NT Backup gives this error:
Error: The device reported an error on a request to write data to media.
If i schedule the backup for 18:00 it works fine. Checked windows power management and all off.