Hard disk keeps turning off or disconnecting?

Colin Law clanlaw at googlemail.com
Sun Aug 12 18:51:10 UTC 2012


On 12 August 2012 18:58, Gilles Gravier <ggravier at fsfe.org> wrote:
> Hi!
>
> I have a strange problem. Ubuntu 12.04. All latest updates and kernel. I
> used to have a 2TB disk connected by USB 2.0 port. I replaced this disk
> (a Western Digital) with a 3TB (same brand, connected on same USB port).
> Now, every 3 or 4 days, suddenly, the disk gets disconnected. As if it
> wasn't mounted anymore. Didn't have the problem with the 2TB.
>
> But... I seem to recall having had that a long time ago on another
> disk... and that this was due to some power management mode on the
> disk... that had to be turned off...
>
> Does that ring a bell to anybody on this list? Any magical command to
> tell the machine to tell the disk that this is a server and I don't want
> spin-downs?
>
> Luckily, this is an ext4 volume... so I don't lose any data. I just have
> to turn off the machine, turn off the disk, then turn everything back
> on... But this is clearly sub-optimal. I would like the machine to keep
> running...

Does dmesg tell you anything after it goes off?

Colin




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