Hi, I just have wasted a handful of blank CD's in an attempt to burn them. host1: Pentium IV 1GHz, SuSE V7.3, CD-ROM, 8GB Partition mounted on /data/workspace which is also shared via NFS. host2: Pentium III 100Mhz, SuSE V7.1, Yamaha 6416 CD Reader/Writer, very little free space, NFS Share host1:/data/wokspace mounted, mount version mount-2.10m, cdrecord version Cdrecord 1.8.1 Procedure followed to copy the CD: 1. on host1 Copy CD raw image with dd if=/dev/hdb of=/data/workspace/image.raw 2. on host1 Make sure all data is readable on host1 mount -o loop -t iso9660 /data/workspace/image.raw /mnt on host1 check everything is there on host1 umount /mnt 3. on host2 burn the raw image with cdrecord -v speed=6 dev=3,0 /data/workspace/image.raw 4. on host2 verify the burned CD on host2 mount /cdrom on host2 Make sure all data is there, Yes, all there on host2 eject on host2 mount /cdrom /dev/scd0: Invalid argument mount: you must specify the filesystem type I can read the burned cdrom immediately after burning it, but after an unmount/eject and mount, its not mountable anymore. Analysis shows that the burned image looks like an audio track. But thats not the whole story yet, its gets even more mysterious. After about 10 stuffed up CDs, I tried to mount the raw image on the NFS share on host2. on host2 mount -o loop /data/workspace/image.raw /mnt ioctl: LOOP_SET_FD: Invalid argument  now this made me very suspicious in regard to failing to mount the burned CDs. So the next thing to do was to copy the file to the local tree. on host2: cp /data/workspace/image.raw / on host2: mount -o loop /image.raw /mnt on host2: umount /mnt So the local file is mountable via loopback, the file on the NFS share isn't. on host2 burn the raw image with cdrecord -v speed=6 dev=3,0 /image.raw on host2 mount /cdrom on host2 Make sure all data is there, Yes, all there on host2 eject on host2 mount /cdrom on host2 umount /cdrom on host2 mount /cdrom Yes, if the raw image file is local, I can burn it and actually use it! Question: What is the difference between a file being on a local partition that is mounted and the same file on a remote host that is mounted via NFS? A diff /data/workspace/image.raw and /image.raw doesn't report anything. However, for mount -o loop and for cdrecord there must be some subtle difference as my experience shows. What is this difference? Thanks for any clues Peter Sutter