What kind of cdrom? Does it support 512k blocksize?
Have you looked at the
<nitpick>
You mean 512-byte block size. The "standard" size is 2048 bytes, but some
Unix boxes require 512 bytes. Some SCSI CD-ROM drives (e.g., Plextor) have
a jumper setting for this. Some (e.g., Toshiba) have an undocumented set
of solder pads that can be bridged for this.
</nitpick>