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remounting read-only GPT filesystem as writable

rated 0 times [ 3] [ 0] / answers: 1 / hits: 8192 / 2 Years ago, tue, november 1, 2022, 5:51:51

I'm trying to read from a rescued macbook harddrive - here's the info from fdisk -l:

Disk /dev/sdc: 250.1 GB, 250059350016 bytes

255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1               1   488397167   244198583+  ee  GPT

I can read the data from it fine, but trying to write (copying files, etc) throws a permission denied error. Changing the permissions also gives an error:

Error setting permissions: Read-only file system.

I tried the solution to this question:

$ sudo mount -o remount,rw '/dev/sdc1'

mount: can't find /dev/sdc1 in /etc/fstab or /etc/mtab

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4 Years ago

answered 2 Years ago wheance · Accepted Answer

First, be aware that your problem has nothing to do with GPT, except indirectly (as noted shortly). Also, as Ubuntu's fdisk doesn't support GPT, your fdisk output is worse than useless -- it's led you to believe that the disk has one partition, whereas it almost certainly has at least two. You should use parted or gdisk to view the partition table, as in:

sudo gdisk -l /dev/sda

sudo parted /dev/sda print

Most Mac disks have a FAT32 EFI System Partition (ESP) as the first partition, but this partition is unlikely to hold any data you want. The data you seek is probably on an HFS+ partition numbered 2 or above.

Once you've found and mounted your HFS+ partition, you may run into a permissions issue, because Ubuntu and OS X assign different user ID (UID) values to the first user by default. See the following question and answers for more on this issue:

How to manage permissions on a shared volume for OSX and ubuntu