Mainly to use with the ventoy.net tool (for superfast OS installs) - need to plug in and out between my desktop and laptop - both of which have USB4/thunderbolt - though not sure of what kind of compatibility to expect between the three.
I have a gen5 ssd in the mobo (about 11-12 GBps read/write) and currently use a fast sandisk usb pen drive (about 300 MBps read) and a typical linux install time dropped from 2-3 minutes on my old desktop (with a gen3 pcie nvme ssd) to something well under a minute on this new PC.
Now looking forward to see what happens with an even faster external boot drive LOL.
I don't think using a TB external will help with that because there is a fair bit of decompression and other CPU constrained processing during an install
A highly unscientific (and anecdotal) example is that I installed Bazzite (Ublue OS) on a Legion Go with a normal cheap USB3 nvme enclosure (Ugreen) right after delivery
A month later, I swapped the internal SSD and this time had the installer on the Thunderbolt disk
I don't recall the install being any faster although I did not time it per se
I think where a TB drive really helps is
a) Sustained writes Ops - Almost every USB3 enclosure slows down to a crawl after the initial burst .. sometimes as low as 70/80 MB/s. Typical USB4s will also slow down after a long sustained operations but still remain close in the lower GB/s scale.. Anecdotally no different from an internal
b) Stability for scenarios where critical data is involved: Since the TB/USB4 enclosures link over the PCIe bus , they appear as native drives to the system and tend to be far more stable/no dropped connections etc
However For fast reads alone, even a 1500-2000/- USB3 enclosure will give you 1GB/s easily - and I don't think any OS installation will need anything faster than that.
I tried this with those 10gbps enclosures and it wasn't pleasant for me with random disconnects (which I believe can be rectified by turning off ASPM) and the heat. Now these near PCIe gen3 speed enclosures could hurt you without some external USB fans XD
I'd like to see this asm2464pd being used with asm1166 HBAs among other things...
As mentioned in the earlier comment, USB3 drives connect over the USB bus and are prone to disconnects or data corruption.
Due to this, I had always been apprehensive of external drives for anything important.
USB4/ TB links are PCIe and in over a year of sustained usage with a ASM2464PD/ Crucial P5+, I have not had a single instance of instability or disconnects.
I recently moved by entire photo library (About a TB , 25 years worth) to an external.. Granted I do have it syncing to the cloud but I'd still never have done that if I had the slightest hint of instability in the last 1 year