identify Alps Electric harddisk

Alps Electric

DRND-10A 10.5MB (ST412, 60.0/??KB/??) MFM, CHS 615x2x17
DRND-20A 21.0MB (ST412, 60.0/??KB/??) MFM, CHS 615x4x17

DRPO-20D 16.0MB (ST412, 60.0/??KB/??) RLL, CHS 615x2x26 [same HD as RPO-20A]

DRR-40 42MB (IDE, 19/??KB/3600)
DRR-105 105MB
DRR-200 200MB