1 Making HFS bootable CDs 2 3 It *may* be possible to make the hybrid CD bootable on a Mac. As I do not 4 have easy access to a CD-R (nor a Mac) at the moment, I have not actually 5 created and written a bootable hybrid to CD - however, I *think* it will work! 6 7 A bootable HFS CD requires an Apple CD-ROM (or compatible) driver, a bootable 8 HFS partition and the necessary System, Finder, etc. files. 9 10 A driver can be obtained from any other Mac bootable CD-ROM using the 11 "apple_driver" utility (to make, type "make apple_driver"). This file can 12 then be used with the -boot-hfs-file option. See below for usage. 13 14 The HFS partition (i.e. the hybrid disk in our case) must contain a 15 suitable System Folder, again from another CD-ROM or disk. 16 17 For a partition to be bootable, it must have it's "boot block" set. The boot 18 block is in the first two blocks of a partition. For a non-bootable partition 19 the boot block is full of zeros. Normally, when a System file is copied to 20 partition on a Mac disk, the boot block is filled with a number of required 21 settings - unfortunately I don't know the full spec for the boot block ... 22 23 I'm guessing that this will work OK ... 24 25 Therefore, the utility "apple_driver" also extracts the boot block from the 26 first HFS partition it finds on the given CD-ROM and this is used for the 27 HFS partition created by mkhybrid. 28 29 To extract the driver and boot block: 30 31 apple_driver CDROM_device > HFS_driver_file 32 33 where CDROM_device is the device name used by the CD-ROM (e.g. /dev/cdrom) 34 35 The format of the HFS driver file is: 36 37 HFS CD Label Block 512 bytes 38 Driver Partition Map (for 2048 byte blocks) 512 bytes 39 Driver Partition Map (for 512 byte blocks) 512 bytes 40 Empty 512 bytes 41 Driver Partition N x 2048 bytes 42 HFS Partition Boot Block 1024 bytes 43 44 The Perl script "hdisk.pl" can be used to give a listing of what's on 45 a Mac CD. hdisk.pl is part of hfsutils. 46 47 A hybrid CD is made using the option "-boot-hfs-file" e.g. 48 49 mkhybrid -boot-hfs-file HFS_driver_file -o hfs.raw src_files/ 50 51 The -boot-hfs-file implies the -hfs option. 52 53 PLEASE NOTE: 54 55 By using a driver from an Apple CD and copying Apple software to your CD, 56 you become liable to obey Apple Computer, Inc. Software License Agreements. 57 58 The driver code (both extracting the driver and creating partitions etc. 59 is based on code from "mkisofs 1.05 PLUS" by Andy Polyakov 60 <appro (a] fy.chalmers.se> (see http://fy.chalmers.se/~appro/mkisofs_plus.html) 61 62 63 Any comments, bug reports/fixes to the address below 64 65 James Pearson (j.pearson (a] ge.ucl.ac.uk) 66 18/5/98 67
Indexes created Fri Sep 18 00:27:12 UTC 2026