Hi, I had created a Hybrid CD containing both ISO and HFS filesystem descriptors. In that design i used the sector size as 2048 only as CDROM specific. I think it only creates wastage of size for small files and limits the density of the filesystem to have a maximum no. of entries (file names). So in my desing the cluster size was multiple of 2048!

Hope it helps, Biswaroop Pierre Duhem pierre@duhem.com wrote: Hello,

Till now, all disk descriptors (in sector 0) I had seen for magnetical disks and CD-ROMs began with 45 52 02 00, that is the physical sector size was always 0x0200 (512d) even on CD-ROMs. On the other hand, I had seen 0x0400 on magneto-optical disks.

Yesterday, I cam across a CD-ROM burnt on a Mac Mini with the integrated burning tool and, to my surprise, I got 08 00 in positions 2 and 3 above.

Any comments?