400k Floppy drive :

Early Sony model OA-D34V.

Later Sony models OA-D34V-02 or OA-D34V-22. These models had a new insert/eject mechanism.

There were two series of external disk drives (model M0130):

Serial number started with D, made in USA.* The earliest of these contained Sony OA-D34V drives. Later they contained OA-D34V-02/22 drives.

Serial number started with Y, made in Japan.* These contained Sony OA-D34V-02/22 drives.

400KB Floppy Drive Maintenance

Vintage Mac 400K Floppy Drive (Model #M130) Repeating Click of Death

Life After the 400K Click of Death