I have added info about 6 and 20 MB Corvus drives (and how to format / use them)
under CP/M 86/80 version 1.
Al Kossow kindly provided driver source for Corvus on Lifeboat CPM 2.2, but this requires - more or less - skillful modification to work with DEC's CP/M 86/80 2.x.
There are wo obstacles: a specific patch address must be determined (RWMLOC & RWMDTA in old source from Maslin), and LDCOPY seems to be hard coded in version 2.x (will not write arbitrary loader files as in CPM 1). See HINSTALL.SUB:(script from *, modifies 3 core CP/M 1.x files)
; CORVUS INSTALLATION DISKETTE IN A, CURRENT SYSTEM DISKETTE IN B
B:STAT B:*.SYS DIR
B:STAT B:*.SYS SYS
B:LDCOPY A:HBOOT.LDR B:
; === THE DISKETTE IN DRIVE B HAS NOW BEEN CONFIGURED FOR USE WITH THE CORVUS DRIVE
Maybe one of the few remaining CP/M experts can have a look (Robert...)?
The TRS-80 variant uses the same type H drives, by the way...http://www.retroarchive.org/maslin/disks/dec/
(Al Kossow's link, from Lifeboat CP/M 2.2):