WANTED BIG SCSI DRIVES- route of problem cpio screw up

Great ;-)
glad to hear I just chuck the disk in :-) I do obsessivly back everything
up to my DLT4000 tape's on a regulat basis but it is nice to know that the
drive is far more robust than the ones that I'm having probs with at the
moment.

*********************
Khalid Schofield
System Administrator / EM Technician
Dept. Of Materials
University Of Oxford
Parks Road
Oxford
OX1 3PH

Email:
Tel: 01865 273785
Fax: 01865 283333
Web: http://www-em.materials.ox.ac.uk/peo...eld/index.html


On Mon, 10 Nov 2003, Malcolm Weir wrote:

On Sun, 9 Nov 2003 08:15:49 +0000, Khalid Schofield
wrote:

If I remember rightly yup they did. Quantum if I remember rightly are the
peeps who produce the DLT tape drives.

Quantum was spun-off from DEC before DEC disappeared.

I ordered an U160 SCA 80 10,000 rpm
72Gb drive yesterday. Can't wait to get it in my desktop (my octane). Are
there any jumpers to set on the drive to tell it to use Single Ended and
not LDV?

(LVD, not LDV) No, that's done by a wire in the interface (/DIFFSENS).

And the whole point of SCA and SCA-2 is to remove the need for
on-drive jumpers....

Khalid Schofield
System Administrator / EM Technician
Dept. Of Materials

Malc.

Per Ekman writes:
Thomas Jahns writes:

And before I forget: most IDE drives are optimized for regular
downtime. IDE drives which are not specified for continuous operation
(which includes quite a share of todays market) often have some fluid
that can only be returned to certain places in the drive when a
spin-down occurs.

I'd be most interested in a reference for that information.

This is from German c't magazine issue 19/1998 page 144.

Please forgive my amateurish translation:

...while Fujitsu, Maxtor and Seagate did not disapprove continuous
operation of their desktop models, an IBM employee gave us the
surprising hint that IBM's desktop drives would live longer if spun
down from time to time. The reason for this lies in the different
coating of disks in desktop versus server drives which is applied to
improve on the start/stop cycle tolerance of the drive. From this
coating comes the disadvantage that in continuous use the lubricant
will cover the read/write heads. This problem is prevented by turning
off the drive because the heads will then be cleaned in the specially
textured landing zone.

The article also mentions that even entry-level server drives (which
are SCSI) have a user adjustable ADM function (automatic drive
maintenance) which would automatically take spin down the drive after
one week of continuous operation. In the DCAS and DORS series the
function was turned on by default, in the DDRS series it was turned
off.

All this was presented in a discussion about how many on/off cycles
different drives could handle (does switching off of hard disk drives
damage the drive apart from saving power and reducing noise?).

As the information is quite dated I should correct my memory:

There once was a time when desktop drives of one manufacturer required
downtime in regular intervals. (Although that one manufacturer then
indeed represented a very big part of the local market.)

Wether this applies equally to todays IDE drives I cannot be sure.

It's fascinating how fuzzy my memory becomes after just five years.

Thomas Jahns
--
"Computers are good at following instructions,
but not at reading your mind."
D. E. Knuth, The TeXbook, Addison-Wesley 1984, 1986, 1996, p. 9

On 11 Nov 2003 18:27:38 +0100
Thomas Jahns wrote:

Per Ekman writes:
Thomas Jahns writes:

And before I forget: most IDE drives are optimized for regular
downtime. IDE drives which are not specified for continuous
operation(which includes quite a share of todays market) often have
some fluid that can only be returned to certain places in the drive
when a spin-down occurs.

I'd be most interested in a reference for that information.

This is from German c't magazine issue 19/1998 page 144.

Please forgive my amateurish translation:

..while Fujitsu, Maxtor and Seagate did not disapprove continuous
operation of their desktop models, an IBM employee gave us the
surprising hint that IBM's desktop drives would live longer if spun
down from time to time. The reason for this lies in the different
coating of disks in desktop versus server drives which is applied to
improve on the start/stop cycle tolerance of the drive. From this
coating comes the disadvantage that in continuous use the lubricant
will cover the read/write heads. This problem is prevented by turning
off the drive because the heads will then be cleaned in the specially
textured landing zone.

The article also mentions that even entry-level server drives (which
are SCSI) have a user adjustable ADM function (automatic drive
maintenance) which would automatically take spin down the drive after
one week of continuous operation. In the DCAS and DORS series the
function was turned on by default, in the DDRS series it was turned
off.

All this was presented in a discussion about how many on/off cycles
different drives could handle (does switching off of hard disk drives
damage the drive apart from saving power and reducing noise?).

I remember this article I even talked IBM into sending us a set of tools
for changing the DDRS' behavior. OTOH I *never* actually did use it,
as my workmates weren't quite interested. In the 2001 I quit working
there; as far as I remember, no drive had failed until that date ;-/

But good I'm not the only one to remember.



--


florian heigl
http://deranfangvomen.de/ contact: fh2-6bone
ich werde taeglich backups machen. ich werde taeglich backups machen.
ich werde taeglich backups machen. ich werde taeglich backups machen.