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Old 03-09-2010, 10:43 AM
"Thomas Schmitt"
Default Bug#573145: dd if=/dev/sr0 does not wait until media is loaded and ready

Package: linux-2.6
Version: 2.6.26-21
Severity: normal


i experience with eSATA and USB failures to read
DVD+RW if the drive tray gets loaded automatically
or if it is still blinking from ongoing loading.

E.g. with dd:

$ dd if=/dev/sr0 of=/dev/null bs=2048 count=1
dd: opening `/dev/sr0': No medium found

dmesg shows no related entries.

It does not help to load the tray explicitely

$ eject -t /dev/sr0 &&
dd if=/dev/sr0 of=/dev/null bs=2048 count=1
dd: opening `/dev/sr0': No medium found

But short time later it is well possible to read

$ dd if=/dev/sr0 of=/dev/null bs=2048 count=1
1+0 records in
1+0 records out
2048 bytes (2.0 kB) copied, 0.0684895 s, 29.9 kB/s

The system was installed via

$ uname -a
Linux debian 2.6.26-2-amd64 #1 SMP
Tue Jan 12 22:12:20 UTC 2010 x86_64 GNU/Linux

Reading with autoloading still works with an IDE
drive at /dev/hda.

Burn programs have no problem with autoloading
on the affected USB/eSATA drive.

Have a nice day


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