Vertical versus horizontal installation
Franc Zabkar
Barracuda drives installed vertically as opposed to horizontally:
http://forums.seagate.com/stx/board/message?board.id=ata_drives&view=by_date_ascending&message.id=17546#M17546
Can anyone offer a reason for the difference?
BTW the results are repeatable over several drives, so it appears to
be a design issue.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Arno
> This Seagate forum thread shows inferior performance results for
> Barracuda drives installed vertically as opposed to horizontally:
> http://forums.seagate.com/stx/board/message?board.id=ata_drives&view=by_date_ascending&message.id=17546#M17546
> Can anyone offer a reason for the difference?
> BTW the results are repeatable over several drives, so it appears to
> be a design issue.
I would suspect that the vertical mounting was inferiour
mechanically.
Arno
--
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: ar...@wagner.name
GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
cal...@fly.srk.fer.hr.invalid
> This Seagate forum thread shows inferior performance results for
> Barracuda drives installed vertically as opposed to horizontally:
> http://forums.seagate.com/stx/board/message?board.id=ata_drives&view=by_date_ascending&message.id=17546#M17546
> Can anyone offer a reason for the difference?
> BTW the results are repeatable over several drives, so it appears to
> be a design issue.
Hi Franc,
this is something I've never heard of! In fact, all drives I've heard about
had no problems with mounting, either vertical or horizontal...
But, if there is a problem with random seek time that's rapidly rising when
in vertical position, then the possibility I can think of right now is that
weaker magnets or magnetic field in voice coil of the actuator are used...
The mentioned drives are all using perpendicular technology for surface
recording, and since the tracks are much closer to each other, maybe there
could be some gravitational or simply actuator momentum issues...
And one more possible explanation... Preamplifier for the signal coming from
the read/write heads is on these type of drives glued, not soldered... So,
maybe there is a design flaw and glue is not holding the preamplifier chip
as it's supposed to... Especially in vertical position and if drive is a bit
hot...
And then, the clicking sound, it's caused when acutator arm hits the inner
most part of the platter... Could be that there is a positioning problem
because of the weak magnet/voice coil or bad preamplifier (signal is not
detected, and there is no feedback, so the control unit of the disk drive is
sending the actuator arm all around to try to find so called servo burst
info to calculate a position)...
I'd bet on this last one, but anything is possible...
--
"Sepavs li snajperisto tuce ?" upita pudinga rascvjetava banderau
ugnjetavu. "Nisam ja nikog bombardiro !" rece salataa pipa "Ja samo
povjesnicaro zigoshe bodljikavm !" By runf
Damir Lukic, calypso@_MAKNIOVO_fly.srk.fer.hr
http://inovator.blog.hr
http://calypso-innovations.blogspot.com/
Franc Zabkar
cal...@fly.srk.fer.hr.invalid put finger to keyboard and composed:
>Franc Zabkar <fza...@iinternode.on.net> kenjka:
>> This Seagate forum thread shows inferior performance results for
>> Barracuda drives installed vertically as opposed to horizontally:
>> http://forums.seagate.com/stx/board/message?board.id=ata_drives&view=by_date_ascending&message.id=17546#M17546
>
>> Can anyone offer a reason for the difference?
>
>> BTW the results are repeatable over several drives, so it appears to
>> be a design issue.
>
>Hi Franc,
>
>this is something I've never heard of! In fact, all drives I've heard about
>had no problems with mounting, either vertical or horizontal...
>
>But, if there is a problem with random seek time that's rapidly rising when
>in vertical position, then the possibility I can think of right now is that
>weaker magnets or magnetic field in voice coil of the actuator are used...
I don't believe that seek time is affected. I suspect that the
increased access times in the vertical orientation may be caused by
read retries. Each retry would add a rotational latency of 8.33ms (one
revolution) to the access time. I believe this interpretation fits the
HD Tune performance graph.
>The mentioned drives are all using perpendicular technology for surface
>recording, and since the tracks are much closer to each other, maybe there
>could be some gravitational or simply actuator momentum issues...
>
>And one more possible explanation... Preamplifier for the signal coming from
>the read/write heads is on these type of drives glued, not soldered... So,
>maybe there is a design flaw and glue is not holding the preamplifier chip
>as it's supposed to... Especially in vertical position and if drive is a bit
>hot...
That's what I suggested at first, but the same problem occurs with a
new drive.
>And then, the clicking sound, it's caused when acutator arm hits the inner
>most part of the platter... Could be that there is a positioning problem
>because of the weak magnet/voice coil or bad preamplifier (signal is not
>detected, and there is no feedback, so the control unit of the disk drive is
>sending the actuator arm all around to try to find so called servo burst
>info to calculate a position)...
>
>
>I'd bet on this last one, but anything is possible...
- Franc Zabkar
cal...@fly.srk.fer.hr.invalid
> >The mentioned drives are all using perpendicular technology for surface
> >recording, and since the tracks are much closer to each other, maybe there
> >could be some gravitational or simply actuator momentum issues...
> >
> >And one more possible explanation... Preamplifier for the signal coming from
> >the read/write heads is on these type of drives glued, not soldered... So,
> >maybe there is a design flaw and glue is not holding the preamplifier chip
> >as it's supposed to... Especially in vertical position and if drive is a bit
> >hot...
> That's what I suggested at first, but the same problem occurs with a
> new drive.
Then it's possible that the whole series of drives are affected by design
flaw... :(
--
Drot proizvodi drazesan u spavacoj sobi crncugau karu
za deset godina. By runf