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Create HFS+ and FAT32 partitions on one external drive.
Authored by: lukep on May 12, '05 12:44:59AM

I was using my external firewire drive formatted according to these instructions with 10.2, and I just upgraded to 10.4 (Tiger). To my surprise, the HFS+ partition seems to have vanished! When I type "hdid /dev/disk1s1" the response is "hdid: attach failed - not recognized".

Disk Utility thinks that the HFS+ partition is formatted with FAT16, and when I verify the partition it says "Invalid BS_jmpBoot in boot block: 000000" and recommends repair. When I look at the disk under Windows with Disk Management, it thinks the space is unformatted!

Any diagnostic ideas you can provide would be greatly appreciated as I need the files on this disk. Thank you!



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Create HFS+ and FAT32 partitions on one external drive.
Authored by: silentaccord on May 12, '05 06:45:21PM

If you have access to a Mac with 10.2 or 10.3, you can use it to recover the data you need from the drive, then use the instructions I posted (the really long post) to recreate the partitions with diskutil and fdisk. The new method works with 10.3 and 10.4. If you need to recreate the partitions on 10.2, you should use the instructions provided by decelerate to upgrade the version of fdisk in 10.2.



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Create HFS+ and FAT32 partitions on one external drive.
Authored by: salvatore on May 17, '05 04:35:33PM

I had the same problem. You can still read the partition by mounting it with mount_hfs:


$ diskutil list
   1:             DOS_FAT_16                    26.6 GB   disk2s1
$ mkdir /mydata
$ sudo mount_hfs /dev/disk2s1 /mydata
$ ls /mydata
I suggest that you backup the data and reformat the drive using the instructions posted above.

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