3M Black Watch 703 Extra Length 9-Track 6250 BPI 1/2" Data Reel Magnetic Tape

3M Black Watch 703 Extra Length 9-Track 6250 BPI 1/2" Data Reel Magnetic Tape

The 3M Black Watch No. 703 is an extra-length, 9-track open-reel magnetic tape formatted at 6250 BPI (bits per inch), supplied in a protective white plastic canister with a secure latch. Part of 3M's well-regarded Black Watch line of data tapes, the 703 was designed for high-density mainframe and minicomputer tape systems requiring the 6250 BPI (GCR) recording standard. This reel is new and unused.

Specifications & What's Included

• Brand: 3M
• Series: Black Watch
• Model: No. 703
• Tape configuration: 9-track
• Recording density: 6250 BPI / 6250 CPI (GCR — Group Code Recording)
• Tape width: 1/2 inch (0.5")
• Length designation: Extra Length
• Format: Open reel (reel-to-reel)
• Canister: White plastic hinged canister with latch clip
• Condition: New, unused

Applications

Nine-track 1/2" open-reel magnetic tape at 6250 BPI is the high-density standard established in the 1970s and widely used through the 1980s and into the 1990s for mainframe and minicomputer data storage, backup, and data exchange. Compatible drives include IBM mainframe tape transports (such as the IBM 3420 and 3480-era reel drives), and similar 9-track transports from manufacturers such as StorageTek, Memorex, and Pertec. The 6250 BPI GCR format was the dominant high-density standard for large-system data interchange in that era — commonly used for data backup, archival, and transferring large datasets between systems. Today, 9-track tape reels like this are primarily sought for legacy data recovery, archival digitization projects, and by collectors maintaining vintage mainframe and minicomputer systems. The 3M Black Watch line was one of the most trusted names in data-grade magnetic media during this period.