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Sometimes you may not be able to mount a HFS partition on linux
and you get the following error:
`mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.`
This is because the the partition is wrapped in a CoreStorage Volume. This can be verfied from the output of fdisk -l.
In the case of this Macbook we get:
`Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors`
__Disk model: ST2000LX001-1RG1__
`Units: sectors of 1 * 512 = 512 bytes`
`Sector size (logical/physical): 512 bytes / 4096 bytes`
`I/O size (minimum/optimal): 4096 bytes / 4096 bytes`
`Disklabel type: gpt`
`Disk identifier: 26B36326-E491-4674-9795-D970A4935EAF`
``
__Device Start End Sectors Size Type__
`/dev/sda1 40 409639 409600 200M EFI System`
__/dev/sda2 409640 391021447 390611808 186.3G Apple Core storage__
`/dev/sda3 391021448 392290991 1269544 619.9M Apple boot`
`/dev/sda4 392290992 802347007 410056016 195.5G Apple HFS/HFS+`
`/dev/sda5 802347008 803586047 1239040 605M Linux filesystem`
`/dev/sda6 803586048 979429375 175843328 83.9G Linux filesystem`
``
` --- `
Normally HFS+ uses 2 volume headers each 1024 bytes in from the beginning and end of the volume. With
CoreStorage wrapping however this is no longer the case, so you have to manually specify the HFS volume
size to fix this. To do this use the `testdisk` utility:
1. `$testdisk /dev/sda ` and select ok for the drive.
2. Select `EFI GPT` for the drive.
3. Press `Analyse` and then `Quick Search`. The output produced will be smaller than the volume given by fdisk
`TestDisk 7.0, Data Recovery Utility, April 2015`
`Christophe GRENIER <grenier@cgsecurity.org>`
`http://www.cgsecurity.org`
``
`Disk /dev/sda - 2000 GB / 1863 GiB - CHS 243201 255 63`
` Partition Start End Size in sectors`
`>P EFI System 40 409639 409600 [EFI]`
__ P Mac HFS 409640 390296359 389886720__
` P Mac HFS 391021448 392290991 1269544`
` P Mac HFS 392290992 802347007 410056016`
``
So now multiply the size by the sector size (389886720*512) =199622000640. This is the offset needed.
4. So can now press q several times to quit the program.
5. The disk can now be mounted as follows:
`$ sudo mount /dev/sda2 -t hfsplus -o ro,sizelimit=199622000640 /mnt`
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