Ulrich Spoerlein wrote:
Sean C. Farley wrote:
On Thu, 3 May 2007, Ulrich Spoerlein wrote:
I had an issue with ripping some DVD's to my laptop before a trip I made
(note: no distribution occurred (for the lawyers :))). I wanted to
just use dd to do it, but dd would fail after a small amount of data was
read. If I first played a little of the DVD with mplayer, then dd would
work afterwards. It probably had something to do with mplayer
whispering sweet nothings to the DVD player.
Wouldn't help in my case, as the disc cannot be accessed in anyway.
But ...
atausb(4) to the rescue!
I recompiled my kernel with atausb(4) to rule out problems inside CAM,
lo' and behold:
umass0: <PLEXTOR DVDR PX-755A, class 0/0, rev 2.00/4.35, addr 121>
umass0: 8070i (ATAPI) over Bulk-Only; quirks = 0x0000
umass0:3:0:-1: Attached to scbus3
cd1 at umass-sim0 bus 0 target 0 lun 0
cd1: <PLEXTOR DVDR PX-755A 1.06> Removable CD-ROM SCSI-0 device
cd1: 40.000MB/s transfers
cd1: cd present [3614880 x 2048 byte records]
(no glabel tasting, no reading from the device possible)
umass0: at uhub3 port 1 (addr 121) disconnected
(cd1:umass-sim0:0:0:0): lost device
(cd1:umass-sim0:0:0:0): removing device entry
umass0: detached
atausb0: <PLEXTOR DVDR PX-755A, class 0/0, rev 2.00/4.35, addr 121>
atausb0: using ATAPI over Bulk-Only
ata2: <USB lun 0> on atausb0
acd1: DEVICE_RESET unsupported
acd1: DVDR <DVDR PX-755A/1.06> at ata2-master USB2
acd1: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
cd1 at ata2 bus 0 target 0 lun 0
cd1: <PLEXTOR DVDR PX-755A 1.06> Removable CD-ROM SCSI-0 device
cd1: 3.300MB/s transfers
cd1: Attempt to query device size failed: NOT READY, Logical unit is inprocess
of becoming ready
GEOM_LABEL: Label for provider acd1 is iso9660/FIREFLY_DISC2.
acd1: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 ascq=0x00
acd1: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 ascq=0x00
acd1: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 ascq=0x00
acd1: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 ascq=0x00
acd1: FAILURE - READ_TOC ILLEGAL REQUEST asc=0x24 ascq=0x00
Might these ILLEGAL REQUESTs give a clue to what is going wrong when
trying to access this device with cd(4)?
Mostly harmless bug that will be fixed in the next few months.
Why is it only reporting/using
3.3MB/s transfers?
Harmless bug that will be fixed in the next few months. It doesn't
reflect the actual speed.
Why can I read and mount the DVD, but mplayer/xine
are still unable to play the DVD? (It works fine on the internal, ATA
attached, crappy NEC drive.)
No idea, sorry. Do you have umass, atapicam, and ata-usb all involved
here? If so, you've made the room a little crowded, and they are all
arguing with each other. I know that ata-usb was inspired by the ata
author having problems with umass and not wanting to fix them there,
but I don't know exactly what was broken or what was fixed.
Perhaps Scott can share some SCSI wisdom on this matter. I really need
to use this drive via Firewire, ie. cd(4), so atausb(4) is no permanent
solution.
Ulrich Spoerlein
PS: why is iostat(1) not working for acd(4) devices?
Because acd doesn't make use of the standard kernel facilities that make
iostat work. It's a deliberate choice by the driver author.
Scott
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