I have done some further tests. I was curious to see what my 12-year-old Sony laptop would make of the problem Seagate disk. The Sony has BING installed on the hard disk, in a multiboot configuration.
Well, BING sees the Seagate disk without any problem, and it shows the correct values for disk size and free size.
I then booted BIBM on the Sony. The only external device that the Sony will boot from is a Sony-branded USB floppy drive. Luckily, I already had a copy of the trial version of BIBM 1.31f installed on a floppy, so I booted that. And... BIBM is NOT able to see the Seagate disk.
What to make of this? I don't know, but it suggests that there is something not quite right with BIBM's USB support.
(1) The 12-year-old Sony has different USB controllers from the brand-new Lenovo.
(2) BING on the Sony can see the Seagate USB2 disk.
(3) BIBM on the Sony CANNOT see the Seagate USB2 disk.
(4) BIBM on the Lenovo CANNOT see either sample of the Seagate USB2 disk.
(5) BIBM on the Lenovo can see other USB2 disks.
-- from CyberSimian in the UK