What about hfs+ file system, `k3b` iso's and `growisofs` makes my blu-ray disk a coaster?

I backed up my MacBook using a Blu-ray burner on my CentOS server. When I try to mount the Blu-ray disk, $ mount -t hfsplus /dev/sr0 /mnt/bluray I get the error, mount: no medium found on /dev/sr0 I _believe_ the write was successful. I use a disk cataloger immediately after I burn every disk, and I have a catalog of the disk contents built from the mounted disk. I didn't give a thought to testing the disk since it was created from files copied to the server and the disk was clearly mounted during the cataloging step. **How I made the backup** Because I can't find a Linux package which plays nice with my Blu-ray drive, I use K3B to write an ISO from files copied to the CentOS server. Then I use growisofs to burn the Blu-Ray: $ growisofs -Z /dev/sr0=mrwizard-archive-001.iso |& tee -a burn.log Other Linux disks I've made will mount, so I know it's not the drive or drivers. I'm 99% sure these are the steps I followed for this Mac OS backup. A grep in history shows I copied files to a directory with the same name as the Blu-ray disk image (also found in history). [UPDATE, just in case it wasn't clear, the backup was made four months ago in March] There are numerous posts around the net talking about hfs+ and CentOS. These recommend the kmod-hfsplus package which I have installed. This package was necessary to transfer the files to CentOS. Also, here's the tail from the growisofs log, 24024383488/24142608384 (99.5%) @1.8x, remaining 0:14 RBU 100.0% UBU 54.3% 24049221632/24142608384 (99.6%) @1.7x, remaining 0:11 RBU 99.8% UBU 43.5% 24078647296/24142608384 (99.7%) @2.0x, remaining 0:07 RBU 100.0% UBU 40.3% 24102764544/24142608384 (99.8%) @1.6x, remaining 0:04 RBU 100.0% UBU 45.7% 24126881792/24142608384 (99.9%) @1.6x, remaining 0:01 RBU 93.8% UBU 39.2% /dev/sr0: flushing cache /dev/sr0: closing track /dev/sr0: closing session :-[ CLOSE SESSION failed with SK=5h/INVALID FIELD IN CDB]: Input/output error. This last error seems to be related to something else . As the OP in this post says the disk is mountable and readable even with this error. Why growisofs made Blu-ray disk won't mount with Mac OS files? Why would the disk appear to be mounted, only to fail mounting later? What might happen as a result of these steps (k3b made iso, growisofs) and files from Mac OS, which might cause problems with this media? What don't I understand about hfs+ file system, k3b iso's and growisofs which makes my disk a coaster? $ dvd+rw-mediainfo /dev/sr0 long INQUIRY: [ATAPI ][iHBS112 2 ][CL0J] MODE SENSE[#3Fh]: 01: 00 80 00 00 00 00 00 00 00 00 05: 40 05 08 00 00 00 00 00 00 00 00 00 00 96 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 08: 04 00 00 00 00 00 00 00 00 00 0D: 00 00 00 3c 00 4b 0E: 04 00 00 00 00 4b 01 ff 02 ff 00 00 00 00 18: 00 01 00 01 00 00 00 00 00 01 00 01 00 00 00 00 00 00 00 00 00 01 00 01 00 00 1A: 00 03 00 00 02 58 00 00 04 b0 1D: 00 00 00 00 00 06 04 b0 00 00 2A: 3f 37 f1 77 29 23 21 14 01 00 20 00 21 14 00 10 21 14 21 14 00 01 00 00 00 00 21 14 00 09 00 00 21 14 00 00 1b 91 00 00 16 0d 00 00 10 8a 00 00 0b 07 00 00 05 84 00 00 00 00 00 00 00 00 00 00 00 00 30: 2e 00 00 00 00 00 00 00 00 00 00 00 00 00 GET [CURRENT] CONFIGURATION: 0000: 00 43 00 00 00 42 00 00 00 41 00 00 00 40 00 00 00 2b 00 00 00 1b 00 00 00 1a 00 00 00 16 00 00 00 15 00 00 00 14 00 00 00 13 00 00 00 12 00 00 00 11 00 00 00 10 00 00 00 0a 00 00 00 09 00 00 00 08 00 00 00 02 00 00 0001: 00 00 00 07 01 00 00 00 0002: 02 00 00 00 0003: 39 00 00 00 0100: 0105: 00 00 00 00 0108: 33 37 37 32 35 31 32 30 31 32 20 32 31 36 31 30 37 35 30 30 34 34 34 20 //ERROR OUTPUT :-( no media mounted, exiting...