On Sat, 23 Jun 2012, maxim naumov wrote:

I am having problems with a recently purchased external HDD:
0bc2:5031 Seagate RSS LLC, FreeAgent GoFlex 1.5TB USB 3.0.

the HDD would work fine for a while but then the kernel would lock up
and require a powercycle. after turning off soft updates on that
filesystem the lock up has disappeared, but the system still reports
lots of errors repeatedly like the following:

Jun 22 17:05:13 xxxx kernel: (da0:umass-sim0:0:0:0): AutoSense failed
Jun 22 17:05:13 xxxx kernel:
g_vfs_done():da0s1d[WRITE(offset=406613852160, length=16384)]error = 5

after getting into that state the HDD seems unresponsive. usbconfig
reset/power doesn't help, you have to physically unplug the drive and
plug it back in.

the same FreeBSD box, same USB socket, same cable, same backup
software and data, but a different USB 3.0 drive (Verbatim 1TB) shows
no errors.

Doing some research on drives lately, I saw notes from Mac users complaining that these drives went off-line due to power saving. Unfortunately I can't find those comments again.

So it's worth trying to disable power saving on that drive. sysutils/ataidle can do it, and can run from rc.conf:
  ataidle_da0="-P 0"

Failing that, the Windows software included with the drive might be able to disable the standby or sleep mode. Apparently some of these drives ignore that and sleep anyway. I would call that defective and return the drive.
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