Dear All,
I have the following problem with readcd: Using the command,
$ readcd -vv dev=0,0,0 -f /tmp/test2.raw
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
Linux sg driver version: 3.1.24
readcd: Warning: controller returns wrong size for CD capabilities page.
readcd: Warning: controller returns wrong size for CD capabilities page.
Capacity: 181489 Blocks = 416857 kBytes = 407 MBytes = 426 prMB
Sectorsize: 2352 Bytes
Copy from SCSI (0,0,0) disk to file '/tmp/test2.raw'
end: 181489
addr: 181489 cnt: 411
Time total: 593.027sec
Read 416857.55 kB at 702.9 kB/sec.
generates the file,
-rw-r--r-- 1 root users 426862128 Oct 30 20:10 test2.raw
However, the image is corrupt. The source CD (actually a CDR) is OK and
repeated applications of readcd give the same written image. However, using dd
to dump the source CD completes without error and gives,
-rw-r--r-- 1 root root 371689472 Oct 30 19:51 test.raw
This image is good, mounting it together with the source CD and doing 'diff -r'
on the two FSs gives no difference.
The CDROM drive is an AOPEN 56 speed device, as follows,
$ cdrecord -inq dev=0,0
Cdrecord 1.11a15 (i586-pc-linux-gnu) Copyright (C) 1995-2002 J�rg Schilling
Using libscg version 'schily-0.5'
Device type : Removable CD-ROM
Version : 0
Response Format: 1
Vendor_info : 'E-IDE '
Identifikation : 'CD-ROM 56X/AKH '
Revision : 'A80 '
Device seems to be: Generic mmc CD-ROM.
Some information on the source CD,
$ isoinfo -i /dev/cdrom -d
CD-ROM is in ISO 9660 format
System id:
Volume id: TESTVOL26
Volume set id:
Publisher id:
Data preparer id:
Application id:
Copyright File id:
Abstract File id:
Bibliographic File id:
Volume set size is: 1
Volume set seqence number is: 1
^^^^^^^---------------- Note to Jorg: You have a trivial typo here
Logical block size is: 2048
Volume size is: 181478
NO Joliet present
NO Rock Ridge present
Any ideas?
Regards.
Tom Crane.
Ps. System is Linux-2.4.19.
Ps2. Since doing the above tests. I have tried a couple more tests:-
(1) Reading another CD (a 'proper' factory pressed one this time). Again readcd
gives a significantly larger file containing a corrupt image.
(2) Using the machine's other drive (a Plextor CDwriter) gives identical and
non corrupt images via both dd and readcd. Is the answer probably bad AOpen
firmware? :-(. If so, is there a workaround? I'd rather not have to change the
frontend my users use (KOnCD), to use dd. In any case this is nasty, if it
were to be tried on a multi session CD...
--
Tom Crane, Dept. Physics, Royal Holloway, University of London, Egham Hill,
Egham, Surrey, TW20 0EX, England.
Email: [EMAIL PROTECTED]
SPAN: 19.875
Fax: +44 (0) 1784 472794
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