[ubuntu-us-mi] cannot reboot/powercycle machine with external USB drive powered on

Robert Citek robert.citek at gmail.com
Tue Jan 5 20:08:20 GMT 2010


Hello all,

I have an Ubuntu machine (dual boots 8.10 and 9.04) that has an
external USB drive (Verbatim 1TB).  If try rebooting or power-cycling
the machine with the drive powered on, the system does not complete
the boot process and drops me into a busybox shell.

That is, these steps work:

- power-off machine, power-off drive, power-on drive, power-on machine
- power-off machine, power-off drive, power-on machine, power-on drive
- power-off drive, power-off machine, power-on drive, power-on machine
- power-off drive, power-cycle machine, power-on drive
- power-off drive, reboot machine, power-on drive

This does not work:

- power-cycle machine with drive kept on
- reboot machine with drive kept on

I suspect that some signal is being sent to the drive during shutdown
that puts the drive into an unusable state that can only be reset by
power-cycling the drive.  Is that correct?

If so, then I have two questions:

1) is there a way to prevent the drive from going into that state?
2) is there a way to resurrect the drive from that state without
power-cycling the drive?

Regards,
- Robert



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