SOLVED (mostly) - Two issues - cdrom_id and duplicate /sys entries

This is on Slackware -current, but with 2.6.21 kernel and udev-109. Sorry for omitting that the first time... :/

Quoted 21 lines · Robby Workman

First, it seems that /lib/udev/cdrom_id is not exporting correct information about the capabilities of optical media drives. This system contains a Lite-On combo cd writer / dvd reader and an NEC dvd writer drive, but the cdrom_id binary returns this for each of them:

root@isotope:/lib/udev# ./cdrom_id --export /dev/sr{0,1,2,3}
ID_CDROM=1

See http://rlworkman.net/attr-walk/ for the udevinfo attribute walks on each of the devices.

Of course, this brings up the second issue: there are only two optical drives in this box, and there are four devices created. 0 and 2 are essentially "mirrors" of one another, as are 1 and 3. Interestingly enough, after dumping the udevinfo output to the files linked above, sr1 and sr3 show different sizes, even though they are the same drive. A diff of the respective files shows a few more things that are different, but none as strange as the size difference... :/

Quoted 5 lines

bash-3.2$ grep size sr?-attributes

sr0-attributes:    ATTR{size}="2097151"
sr1-attributes:    ATTR{size}="4"
sr2-attributes:    ATTR{size}="2097151"
sr3-attributes:    ATTR{size}="9143552"