Verify CD image

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I downloaded some ISOs and burnt them to CD using xcdroast.
I now would like to verify the images. I have done

# xcdroast -scanbus

and found two devices there, one of which is a USB drive I
have, the other is the CD writer.

I tried

# readcd dev=0,0,0 f=reread.iso

and heard the USB drive crank up. A ^C later and see 30MB
file. Ok, looks like reacd can read devices.

I insert the CD into the drive, and see the icon appear
on the desktop. Ok, it's mounted. Double click on the icon,
and I can browse some directories on the CD. Looks good.
Let's copy back to a file, and verify.

# readcd dev=1,0,0 f=reread.iso
readcd: Input/output error. test unit ready: scsi sendcmd: no error
CDB:  00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: F0 00 02 00 00 00 00 0A 00 00 00 00 3A 00 00 00
Sense Key: 0x2 Not Ready, Segment 0
Sense Code: 0x3A Qual 0x00 (medium not present) Fru 0x0
Sense flags: Blk 0 (valid)
cmd finished after 0.005s timeout 40s
readcd: Device not ready.

Hmm. Maybe I neet to unmount

# umount /mnt/cdrom

The icon disappears from the desktop. The CD remains in
the drive.

# readcd dev=1,0,0 f=reread.iso
readcd: Input/output error. test unit ready: scsi sendcmd: no error
CDB:  00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: F0 00 02 00 00 00 00 0A 00 00 00 00 3A 00 00 00
Sense Key: 0x2 Not Ready, Segment 0
Sense Code: 0x3A Qual 0x00 (medium not present) Fru 0x0
Sense flags: Blk 0 (valid)
cmd finished after 0.004s timeout 40s
readcd: Device not ready.

Hmm. There must be something that I don't know or
understand. What is it?

Mike
--
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
You have found the bank of Larn.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!


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