Thursday, May 28, 2026

macos – USB Disk Enclosure — Drive Beforehand Related by way of Thunderbolt not Recognised

I’ve two 4-bay OWC Thunderbay 3 exterior drive enclosures permitting me to attach 8 laborious drives by way of Thunderbolt to my 2018 Mac Mini.

I not too long ago eliminated one of many drives that I am changing, however I needed to attach it externally (for redundancy through the alternative). I linked it by way of a Sabrent USB 3 disk enclosure, however macOS now not recognised it.

The partition map appeared appropriate (3 partitions of the sizes I anticipate) however the kinds of the 2 fundamental partitions weren’t proven — the filesystem appeared as 0xEE somewhat than ZFS Dataset accurately.

Nevertheless, if I join the identical disk in the identical USB enclosure to a Linux machine (TrueNAS) it appears to be recognised appropriately.

Is that this a macOS particular compatibility downside with a USB enclosure? Is there any approach to make sure I get an enclosure that macOS will assist absolutely? I solely have restricted area within the Thunderbolt enclosures, and at £400 every I do not wish to purchase one other one only for juggling drives round, however clearly if drives I join by way of USB 3 will not be recognised if I swap them out (or might not be recognised if I swap them in) is not appropriate.

I am on macOS Sequoia in case that is related.

Replace: One situation I’ve seen is the drive faraway from the Thunderbolt enclosure and put within the USB enclosure seems in diskutil as FDisk_partition_scheme somewhat than GUID_partition_scheme prefer it must be (and was when inside).

Any concept why it must be detected so incorrectly? ZFS codecs drives as GUID by default, so this could be the reason for the difficulty, but it surely is senseless to me why it must be detected incorrectly by way of USB, except in fact the Thunderbolt enclosures are the issue?

Replace 2: Simply seen one other oddity — the drive in query is reported as having a block dimension of 4096 when linked by way of USB, nevertheless within the Thunderbolt enclosures the identical drives are reported as 512 which is the extra appropriate, as these are 512e drives (as most now are).

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