9-track tapeHalf inch tape wound on open reels.
Common sizes: 600', 1200', 2400'.
Also available: 100', 300', 3600'
Photo: 2400' reel (Photo is half the scale of photos of other media.)
All 9-track media is the same regardless of reel size, except the 3600' reels, which use a thinner media and the same reel diameter as the standard 2400' tapes.
9-track tapes can be recorded in four densities: 800, 1600, 3200, 6250 BPI (Bits Per Inch).
800 BPI is a very old format seldom seen now.
3200 BPI was a little-used format and the least common.
1600 BPI and 6250 BPI are the most common formats.
Approximate tape capacity with a large block size:
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