$ diskutil info disk2s1 | grep 'Block Size' MacOS: $ diskutil info disk2 | grep 'Block Size'

I don't have the faintest idea where to start on this issue – what could be the problem here? NB: (I tried following these instructions for FUSE for macOS, but I suppose they're not really relevant since exFAT should be supported natively in macOS these days.) Mount: disk2s2: unknown special file or file system. The drive also shows up in diskutil as disk2s2 but I can't mount it: /dev/disk2 (external, physical):Ģ: Microsoft Basic Data WD My Book 8.0 TB disk2s2 The drive mainly contains a Synology HyperBackup file (.hbk) which makes up almost single-handedly all of those 4.2 TB.Īccording to Synology DiskStation, the main partition is exFAT and I think the EFI partition is vfat:

As can be seen in the screenshot below, usage is around 4.2/8 TB. I have run 'First Aid' with no errors.ĭisk Utility incorrectly thinks that the usage is 8/8 TB. The drive shows up in Disk Utility, but mounting does nothing. I am able to mount and read the drive when I connect it to the NAS, but not on macOS Sierra 10.12.6. I can't recall exactly how it was formatted, but I believe it was done with Synology's DiskStation for my Synology NAS.

Total Size: 64.I have a Western Digital MyBook (25EE) 8TB External Drive. Volume Name: Not applicable (no file system) fdisk doesn't do anything.Īny ideas how to fix a disk that is this severely screwed? -bash-3.2# diskutil listġ: Apple_Boot Recovery HD 650.0 MB disk1s1Ģ: Apple_HFS Mac OS X Base System 1.3 GB disk2s2ĭevice / Media Name: Corsair Performance3 SSD Media When I attempt to run fdisk to correct the MBR. I get an 'error 6988 couldn't unmount disk'. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there but I can never erase or partition it. I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install.

Mac could not unmount disk