* external drive size differences
@ 2004-08-15 9:37 Nigel Kukard
2004-08-15 11:59 ` Alan Cox
2004-08-17 18:37 ` Brian Jackson
0 siblings, 2 replies; 6+ messages in thread
From: Nigel Kukard @ 2004-08-15 9:37 UTC (permalink / raw)
To: linux-kernel
Something very very interesting... below is an external drive enclosure
supporting both USB2 and Firwire, fitted with a 200Gb IDE Hdd.
When plugged into the firewire bus, i get 137Gb size, when plugged into
the usb bus, i get 200Gb size.
Could this be a bug in the kernel? or external hardware?
<snip>
ieee1394: sbp2: Logged into SBP-2 device
ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [2048]
Vendor: WDC WD20 Model: 00JB-00FUA0 Rev:
Type: Direct-Access ANSI SCSI revision: 06
SCSI device sdb: 268435455 512-byte hdwr sectors (137439 MB)
sdb: asking for cache data failed
sdb: assuming drive cache: write through
sdb: sdb1
</snip>
<snip>
scsi7 : SCSI emulation for USB Mass Storage devices
Vendor: USB 2.0 Model: Storage Device Rev: 0100
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdb: 390721968 512-byte hdwr sectors (200050 MB)
sdb: assuming drive cache: write through
sdb: sdb1
</snip>
Regards
Nigel Kukard
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: external drive size differences
2004-08-15 9:37 external drive size differences Nigel Kukard
@ 2004-08-15 11:59 ` Alan Cox
2004-08-15 14:07 ` Nigel Kukard
2004-08-17 18:37 ` Brian Jackson
1 sibling, 1 reply; 6+ messages in thread
From: Alan Cox @ 2004-08-15 11:59 UTC (permalink / raw)
To: Nigel Kukard; +Cc: Linux Kernel Mailing List
On Sul, 2004-08-15 at 10:37, Nigel Kukard wrote:
> Something very very interesting... below is an external drive enclosure
> supporting both USB2 and Firwire, fitted with a 200Gb IDE Hdd.
>
> When plugged into the firewire bus, i get 137Gb size, when plugged into
> the usb bus, i get 200Gb size.
>
> Could this be a bug in the kernel? or external hardware?
Your firewire adapter doesn't support large drives I would suspect.
137Gb is the exact limit of a non LBA48 aware adapter.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: external drive size differences
2004-08-15 9:37 external drive size differences Nigel Kukard
2004-08-15 11:59 ` Alan Cox
@ 2004-08-17 18:37 ` Brian Jackson
1 sibling, 0 replies; 6+ messages in thread
From: Brian Jackson @ 2004-08-17 18:37 UTC (permalink / raw)
To: Nigel Kukard; +Cc: linux-kernel
On Sun, 15 Aug 2004 11:37:59 +0200, Nigel Kukard <nkukard@lbsd.net> wrote:
> Something very very interesting... below is an external drive enclosure
> supporting both USB2 and Firwire, fitted with a 200Gb IDE Hdd.
>
> When plugged into the firewire bus, i get 137Gb size, when plugged into
> the usb bus, i get 200Gb size.
>
> Could this be a bug in the kernel? or external hardware?
More than likely hardware. Most of the oxford chips that are so often
used in firewire enclosures, don't support >137G drives. It probably
uses a different chip for the usb side of things.
--Iggy
>
> <snip>
> ieee1394: sbp2: Logged into SBP-2 device
> ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [2048]
> Vendor: WDC WD20 Model: 00JB-00FUA0 Rev:
> Type: Direct-Access ANSI SCSI revision: 06
> SCSI device sdb: 268435455 512-byte hdwr sectors (137439 MB)
> sdb: asking for cache data failed
> sdb: assuming drive cache: write through
> sdb: sdb1
> </snip>
>
> <snip>
> scsi7 : SCSI emulation for USB Mass Storage devices
> Vendor: USB 2.0 Model: Storage Device Rev: 0100
> Type: Direct-Access ANSI SCSI revision: 02
> SCSI device sdb: 390721968 512-byte hdwr sectors (200050 MB)
> sdb: assuming drive cache: write through
> sdb: sdb1
> </snip>
>
> Regards
> Nigel Kukard
^ permalink raw reply [flat|nested] 6+ messages in thread
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2004-08-15 9:37 external drive size differences Nigel Kukard
2004-08-15 11:59 ` Alan Cox
2004-08-15 14:07 ` Nigel Kukard
2004-08-15 13:07 ` Alan Cox
2004-08-15 14:26 ` Nigel Kukard
2004-08-17 18:37 ` Brian Jackson
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