#CANT FORMAT EXTERNAL HARD DRIVE MAC MAC OS#
#CANT FORMAT EXTERNAL HARD DRIVE MAC WINDOWS#

It suddenly and unexpectedly did not Mount after a reboot. I have a 4TB WD My Passport, ExFAT, being used on MacOS 10.14.6 Just wanted to record my experience for those who follow after. 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 вЂ“ maybe it has some relevance? GPT PMBR size mismatch (4294967294 != 2743150591) will be corrected by w(rite).Дisk /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 вЂ“ 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):Дў: 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.ДЄccording 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.Дisk 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. WARNING:Formatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting.I have a Western Digital MyBook (25EE) 8TB External Drive.

#CANT FORMAT EXTERNAL HARD DRIVE MAC MAC OS#

Set Format to Mac OS Extended (Journaled) Check step 2 to confirm Disk Utility is Showing All Devices. NOTE: If you donвЂ™t see Scheme, then make sure that all devices are showing and the non-indented entry is selected.

Select the non-indented entry, you will see Media in the nameД¬lick the button labelled Erase in the menu which will bring up this window.

Click View in the upper left and select Show All Devices.To open Disk Utility - Open Finder > Applications > Utilities > Disk Utility IMPORTANT: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting.

#CANT FORMAT EXTERNAL HARD DRIVE MAC WINDOWS#

If you need to go between macOS and Windows then format your drive ExFAT on macOS

Mac OS Extended (Journaled) does not work natively with Windows.

Starting with Big Sur, Mac OS Extended (Journaled) is no longer the default when using Time Machine.

It is important to keep the following in mind when formatting Mac OS Extended (Journaled): Not sure what version you are using? Click here to determine your version of macOS IMPORTANT:В This article applies to the following macOS versions:

Cant format external hard drive mac