boo0330: >>> Now I can detect CD-R, CD-RW very well by -atip >>> but are there information about the CD-R is closed, or it's blank, can >>> write or not? me: >> I can distinguish them by this shell code snippet which does a 1 byte >> test read : >> if dd if=/dev/sr0 of=/dev/null bs=1 count=1 >> then echo "Has data" ; else ; echo "Seems to be empty" ; fi J�rg: > This does not work correctly in all cases. > Use the "official" way and call readcd sectors=0-0
readcd is very appealing for that purpose because it uses the same addresses as cdrecord. I read in man readcd : "... so sectors=0-0 will not read anything and may be used to check for a CD in the drive." I read further and tried this shell snippet : if readcd dev=0,0,0 sectors=0-0 f=- >/dev/null 2>&1 then echo success else echo failure fi As announced by the manual it does react on a blank CD-R with the same exit value as on a CD-R which carries a closed session. There is a difference visible in one of the stderr output lines, though. Blank CD-R : Capacity: 1 Blocks = 2 kBytes = 0 MBytes = 0 prMB Written CD-R : Capacity: 126018 Blocks = 252036 kBytes = 246 MBytes = 258 prMB Did i miss any better trick here ? Additionally the question is still open about how to see wether a CD-R(W) is finally closed or wether it is still appendable. Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
