Donkey Kong Jr.

What do I need to use a Famicom Disk System? Is it a standalone console?

The Famicom Disk System is an add-on peripheral, not a standalone console. You need three components: (1) a standard Famicom or AV Famicom, (2) the FDS disk drive unit itself, and (3) the RAM adapter -- a cartridge-shaped module that connects the Famicom's cartridge slot to the FDS. The RAM adapter is not a separate purchase in most lots but verify it is included before buying. The drive connects to the Famicom's expansion port on the bottom of the unit via a cable. Power for the drive comes from 6x C (UM-2) batteries in the compartment on the bottom of the drive; an AC adapter (HVC-025) was also sold separately.

Is the belt likely to be broken on a unit I am buying today?

Yes, almost certainly. The original belt has a practical lifespan of 10-20 years; all surviving units are well past that. Assume any FDS drive you purchase will require a belt replacement before it will read disks reliably. This is a known and well-documented repair costing a few hundred yen in parts. A drive sold as working by a retro shop has likely already had the belt replaced -- ask to confirm. A drive sold untested or as-is at auction almost certainly has a failed belt.

Can I still get games for the Famicom Disk System?

Yes, FDS disks are widely available in the Japanese second-hand market. The format supported 192 known titles, with many being Japan-exclusive versions of games that later received cartridge releases (The Legend of Zelda, Metroid, Super Mario Bros. 2, Castlevania). Disk condition varies: the magnetic coating can degrade, causing read errors. A working drive will show an error code on bad disks rather than freezing. Disks can also be rewritten (the original Disk Writer service ended in 2003, but modern flash-based FDS adaptors allow all 192 titles to be loaded from a single card).

My Famicom Disk System shows Error 22 or Error 27. What do these mean?

Error 22 means the disk cannot be read -- the most common cause is a failed drive belt, causing the disk to spin at the wrong speed. After belt replacement, Error 22 typically resolves. Error 27 indicates a CRC checksum failure, meaning the data was partially read but is corrupted -- this can indicate a degraded disk, a dirty drive head, or an alignment issue after belt replacement. Clean the read head with a cotton swab and 90%+ isopropyl alcohol before suspecting disk degradation.

How can I tell a genuine FDS disk from a bootleg or unlicensed copy?

Genuine Famicom Disk System cards carry the word "NINTENDO" moulded into the plastic of the card itself. This was not branding — it was physical copy protection: a matching shape inside the drive mates with those raised letters, and a card without them will not seat correctly. Unlicensed and bootleg publishers worked around this by moulding deliberately altered text (commonly misspelled as "NINFENDO" or "NINIENDO") or by cutting a notch to clear the drive's locking tab. For most buyers this rarely matters: loose disks in the Japanese second-hand market are overwhelmingly genuine, and the games still load. It becomes worth checking only on sealed or graded items, where authenticity carries a price premium — there, a reglued seal or off-colour label art is a warning sign.

Is there a way to play FDS games without dealing with the drive belt at all?

Yes. Flash devices such as the FDSKey and the FDSStick load disk images from an SD card or internal memory and run directly from the RAM adapter — the disk drive, its belt, and physical disks are not used at all. Because the Disk System's extra sound channel lives inside the RAM adapter rather than the drive, music still plays exactly as intended. This sidesteps the belt problem entirely and is a practical route for players who simply want the games running. Collectors who value the original mechanism, the sound of the drive, and physical disks will still want a serviced drive — the two paths answer different wishes.