If you got a basic Amiga and a Subway (or a Highway), you can now boot like A1000 did it in the past. With a boot disk!
A usb->sata interface + disk is needed.
(thumbs are not reliable)
The system must be prepared on a PFS3 partitioned disk.
WinUAE can do this job, if your system disks are out.
Not really speedy, but it can help.