Technical Details
- Density
- Initial recording density was 100 characters per inch. Later models supported 200, 556 and 800 characters per inch.
- Inter-record Gap
- A gap (initially one inch, later 3/4 inch) between records allowed the mechanism time to start and stop the tape.
- Latency
- There was only a 1.5ms delay for the stopped tape to reach its full reading or writing speed.
- Markers
- Aluminum strips were glued several feet from the ends of the tape to serve as logical beginning and end of tape markers.
- Write protection
- A removable plastic ring in the back of the tape reel was used to indicate whether writing should be permitted.
Read more about this topic: IBM 7 Track
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