I came across a situation where I was asked whether LTO3 media written on LTO4 drive is readable in LTO3 drive.
Answer is yes because LTO does not allow writing a different format on one media type.
I have seen this in one of my customer's environment where library is using a mix of LTO3 and LTO4 drives with all LTO3 media and there has never been any issue while restoring data using LTO3 drives ,doesn't matter whether data was written in LTO4 drive. On LTO3 media , LTO4 would be writing in LTO3 format only.
All LTO generations are backward compatible with one generation back for both read/write and two generation back for read only operations.
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