The LTO capacities you show in your image are compressed capacities, transfer rates are also based on compressed data. I am a Backup Manager working for an Enterprise level organisation & I never base my calculations on compressed data sizes. Many file containers are already heavily compressed. On average I'd say we see data compressed to 80% its original size. Tape is cheap but slow (relative to HDD arrays). Based upon current LTO6 drives speeds it would take just over 13 days of to fill a 185 TB tape ... that's presuming that the 185 TB's figure that Sony are quoting is uncompressed (doubtful). I'd hope that write speeds to its new media type greatly exceed those of LTO6.