On 22 August 2018 at 08:20, John Nemeth <[email protected]> wrote: > On Aug 22, 9:12am, Benny Siegert wrote: > } On Tue, Aug 21, 2018 at 9:36 PM Mike Pumford <[email protected]> > wrote: > } > Not really its been a pretty universal experience of very old systems > } > for me that they don't like being stressed or powered off. :( > } > } In particular: In hard drives that run continuously for months or > } years, the centrifugal forces gradually displace the lubrication of > } the spindle outward. When the disk powers down, the axis may get > } stuck. > > I believe modern disks are less prone to stiction. However, > the original poster did say these are old disks. The "solution" > is to power it up and "gently" shock it, i.e. lift one end about > an inch and drop it. >
I still remember a Sun engineer "adjusting" a Quantum 105 disk which had failed due to stiction. He'd bought a replacement disk, but asked if there was any data we'd like off the old disk. We said there was some which would be nice but not critical. He said "OK, I can try something, but I need to you be happy to accept that all data is lost on this old disk" "Yes" "Absolutely happy that the data is gone" "Yes" <bang> <bang> <bang> (Slams the end of the disk vigorously into the floor, then connects it back to the SS1+) (We hear the disk spinning up and the machine starts to boot) "OK, if you want a copy of any of your lost data, now is the time" David
