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So, I have an External SSD of 2TB. I was unable to mount it after removing it accidentally from my laptop, without ejecting it. Then, I for some reason tried running the command:

sudo asr adjust --target /dev/disk4s2 --settype "Apple_HFS"

For my external hard disk. It is actually of ExFAT type, but after that it started showing Apple_HFS type, since I knew it was of type ExFAT I then ran:

sudo asr adjust --target /dev/disk4s2 --settype "ExFAT"

While, both commands ended in some failure. Now on running diskutil list I get this:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:             Apple_APFS_ISC Container disk1         524.3 MB   disk0s1
   2:                 Apple_APFS Container disk3         494.4 GB   disk0s2
   3:        Apple_APFS_Recovery Container disk2         5.4 GB     disk0s3

/dev/disk3 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +494.4 GB   disk3
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            20.5 GB    disk3s1
   2:              APFS Snapshot com.apple.os.update-... 20.5 GB    disk3s1s1
   3:                APFS Volume Preboot                 12.2 GB    disk3s2
   4:                APFS Volume Recovery                1.9 GB     disk3s3
   5:                APFS Volume Data                    380.9 GB   disk3s5
   6:                APFS Volume VM                      24.6 KB    disk3s6

/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +4.0 GB     disk5
   1:                 Apple_APFS Container disk6         4.0 GB     disk5s1

/dev/disk6 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +4.0 GB     disk6
                                 Physical Store disk5s1
   1:                APFS Volume AppleTVOS 16.4 Simul... 3.6 GB     disk6s1

/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +4.2 GB     disk7
   1:                 Apple_APFS Container disk8         4.2 GB     disk7s1

/dev/disk8 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +4.2 GB     disk8
                                 Physical Store disk7s1
   1:                APFS Volume WatchOS 9.4 Simulator   3.9 GB     disk8s1

/dev/disk9 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        +268.5 MB   disk9
   1:        Apple_partition_map                         32.3 KB    disk9s1
   2:                  Apple_HFS DiskDrill               268.4 MB   disk9s2

/dev/disk10 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk10
   1:                        EFI EFI                     209.7 MB   disk10s1
   2: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF               2.0 TB     disk10s2

Here below, disk10s2 is now my drive. And it is showing completely stuck. Using DMDE I was able find that my drive looks to be still there. Can anyone help !!? DMDE Screenshot

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  • Welcome to Ask Different. Great details. For you help, what does success look like specifically for your disk 4? Those seem odd commands to “try for some reason” - are you in the middle of testing if you can restore a backup?
    – bmike
    Commented Sep 30 at 19:08

1 Answer 1

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Download and install GPT fdisk. Next, enter the following command. Here I assume the external drive is still /dev/disk10.

sudo gdisk /dev/disk10

The gdisk command is interactive. Enter the following.

t
2
700
w
y

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