Normally it isn't possible to mount all the discs of a changer at once, that is because when you mount one slot you can't change to another anymore, because the cdrom gets locked. And of course you'll have to unmount it and then you'll have to change discs by hand. Ok you could do this with a script... but what if you want to share the drives with NFS or Samba and you don't want people to have to hassle with the scripts... let alone when multiple people try...

This little wrapper solves this problem. When it is loaded by the kernel it seeks in the Unified CdRom driver list and checks for changers (capacity>1&changable). It adds these devices to an changer-internal list, opens them and adds them to the changer-devices minor list. The devices changer:minor can then be mounted like any other normal cdrom device, as it acts like a single cdrom device... The other minors can also be mounted at the same time as the changer-wrapper will change to the appropriate slot when it needs access to it. NOTE: This driver works with ANY cdrom driver, not only IDE but also scsi and other drivers supporting the Unified CdRom driver changing mechanism.

I use "block=2048" to increase read performance a bit and also helps against to many changes as now it'll change at least per 2048 bytes. The changer-part of the fstab on heaven looks like:
/dev/changer0 /cdrom/1 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0
/dev/changer1 /cdrom/2 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0
/dev/changer2 /cdrom/3 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0
/dev/changer3 /cdrom/4 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0
/dev/changer4 /cdrom/5 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0
/dev/changer5 /cdrom/6 iso9660 defaults,ro,noexec,nosuid,unhide,block=2048 0 0

A version number is simply the date of the driver. So 19780225 = 25 February 1978. The newest version will always be available from the Unfix Website at : http://unfix.org/projects/changer/. For enquiries, bug-reports etc. send an email to jeroen@unfix.org.

The following versions are available for you to download:

Date			Name	Diffed Kernel Version	tar.gz	bzip2
16	March	1999	The 1st Alpha	N.A.	tar.gz	bzip2
17	March	1999	The 2nd Alpha	N.A.	tar.gz	bzip2
19	March	1999	The 3rd Alpha	N.A.	tar.gz	bzip2
24	March	1999	The 1st Beta	2.2.4	tar.gz	bzip2
07	April	1999	The 2nd Beta	2.2.5	tar.gz	bzip2
29	April	1999	The 3rd Beta	2.2.6-ac2	tar.gz	bzip2
19	May	1999	The 4th Beta	2.2.9	tar.gz	bzip2
01	February	2000	1st Stable	2.2.14 & 2.3.38	tar.gz	bzip2

See the changer.desc for latest updates.
For installation info check the README included in the archive.