We are in Sequoia on a new M4 Mini. Decided to do speed tests on our 3 external SSDs, which are connected via a USB2 hub (but we see same results when connected directly).
Trimforce is set ON.
SSD#1 is T7 Shield 2TB. GUID, 10 Partitions, all MacOS Extended Journaled. Data volumes.
Write/Read ~775 / ~600MB/s 24 months old.
SSD#2 is T7 2TB. MBR, 10 Partitions, all MacOS Extended Journaled. Backups of #1.
Write/Read ~100 / ~600MB/s 16 months old.
SSD#3 is T7 Shield 2TB. GUID, 3 Containers, all APFS. Miscellaneous OS versions.
Write/Read ~800 / ~600MB/s 14 months old.
When we run Disk Utility First Aid, only SSD#1 shows "trimming unused blocks", 5 lines above completion.
We are guessing that the lack of trim actions has slowed SSD#2?
And that trimming is simply not reflected in that process for APFS on SSD#3?
When new, SSD#2 had after performance like the other two.
Is it time to wipe SSD#2 (and maybe change to GUID?)
Or is there a way to force trim, from a different environment?
