The IBM 728 was an IBM 7 series magnetic tape drive. It was used on the SAGE AN/FSQ-7 computer. It was physically similar to the IBM 727, but with significantly different specifications.[1]
| Tracks | 6 Data, 1 synchronization |
| char/inch | 248 char/inch |
| Words | 6 chars (32 data bits, 1 odd parity bit, 3 end of file bits) |
| word/inch | 41.33 word/inch |
| End of record gap | 0.75 inch - 186 chars - 31 words |
| Tape speed | 75 inch/s |
| Rewind speed | 500 inch/s (average) |
| Transfer rate | 18,750 char/s - 3,125 word/s |
| Start time | 5 ms |
| Stop time | 5 ms |
| Width of tape | 1/2 inch |
| Length of reel | 2400feet |
| Composition | Mylar or cellulose acetate base |