When you store 129 GB on the 35 GB native capacity tape, your compression ratio is 129/35 = 3.7 (approximately). That is still normal. For practical purposes, you could consider 10:1 to be a maximum compression ratio, which would impose a 'practical' limit of 350 MB on your tape.
If you want...
The tape can only physically hold 35 GB, which is a physical limit. 70 GB is not a limit, it is an estimate based on a 'typical' (Not maximum!) compression ratio of 2:1. So if you experience 2.74:1 (higher than 2:1) compression ratio, you can store *more* than 70 GB on the tape, eg. 96 GB...
These are just general suggestions on how to solve such a problem:
1) The message says that there is a cleaning tape in the drive, when a "writable" tape is expected. You didn't say whether the message was correct or not. It could be that someone else, or a robot/picker/loader has...
I just want to clarify that 70 GB is not the maximum size of the "35/70" tape. 35 GB is the native capacity of the tape, which is a maximum. 70 GB is an estimate of the compressed data that will fit, assuming that the compression ratio is 2:1. However, the compression ratio is data...
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