macOS requires the EFI volume to be unmounted or it will complain about not properly ejecting disks. The volume that fails to mount is the primary exFAT volume. I/O size (minimum/optimal): 4096 bytes / 4096 bytes Sector size (logical/physical): 512 bytes / 4096 bytes Notice the GPT PMBR size mismatch – maybe it has some relevance? GPT PMBR size mismatch (4294967294 != 2743150591) will be corrected by w(rite).ĭisk /dev/sdq: 7.3 TiB, 8001562869760 bytes, 15628052480 sectors $ diskutil info disk2s2 | grep "Block Size"
$ 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.
I have a Western Digital MyBook (25EE) 8TB External Drive.
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