identify BASF harddisk

BASF Magnetics

6187 7.5MB (ST-412, ??/??KB/??) MFM, CHS 440x2x17, 5.25"
6186 15.0MB (ST-412, ??/??KB/??) MFM, CHS 440x4x17, 5.25"
6185 22.5MB (ST-412, ??/??KB/??) MFM, CHS 440x6x17, 5.25"
6188-R1 10.4MB (??, ??/??KB/??) CHS 612x2x17, 5.25"
6188-R3 20.8MB (??, ??/??KB/??) CHS 612x4x17, 5.25"