readcd always fails on cdrtools-prepared CDR's

[csj@gmx.co.uk]

As the title says, readcd always fails when I try to copy a CDR
prepared by cdrecord and mkisofs.  I use both the simple command
"readcd dev=0,0,0 f=cdrom" and the added option "-clone" (sample
output appended below).  The files in the CDR, however, are free
from any data error, when I check them against the original files
using "diff" or "md5sum".

What, if any, additional options do I need to pass to readcd so I
can duplicate (clone) the original ISO image produced by mkisofs?
I need this to verify the integrity of my archived data without
the use of embedded MD5SUMs.

### BEGIN SHELL OUTPUT ###
$ readcd -clone dev=0,0,0 f=cdrom.iso
Read  speed:  2816 kB/s (CD  16x, DVD  2x).
Write speed:  1760 kB/s (CD  10x, DVD  1x).
Capacity: 161491 Blocks = 322982 kBytes = 315 MBytes = 330 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (0,0,0) disk to file 'cdrom.iso'
end:    161491
readcd: Input/output error. read_g1: scsi sendcmd: no error
CDB:  28 00 00 02 76 80 00 00 53 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 03 00 02 76 D1 0A 00 00 00 00 11 00 00 00
Sense Key: 0x3 Medium Error, Segment 0
Sense Code: 0x11 Qual 0x00 (unrecovered read error) Fru 0x0
Sense flags: Blk 161489 (not valid) 
cmd finished after 5.174s timeout 40s
readcd: Input/output error. Cannot read source disk
readcd: Retrying from sector 161408.
..................................................................................~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~-~~~+~~~

### END SHELL OUTPUT ###
### NOTE Ctrl-C was pressed ###