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" Before, it would mount, then unmount, and after a while it would mount again and I could use the harddrive just fine.
$ diskutil info disk2s1 | grep "Block Size" External Hard Drive Not Mounting to Mac Hey everyone, I'm having a tough time trying to get my Mac to detect my external harddrive (WD 4TB Elements Harddrive). 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? Edit 1: Block Sizes 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.
I wanted to use this mount drive feature to plug in USB TV Media Player Hard Disk to my MacBook in 'Living Room' so my iMac in the 'Office' can direct transfer files to the USB Media Player Hard Disk using AirPort Network user sharing. 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 does not mount: External USB Hard Disk, USB iPod, USB Thumb Drive in browsing Network Sharing. 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 in a 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.