What is the difference between the types (generations) of LTO?

Generation	Capacity		Data Transfer Speed	Additional Features
	Native	Compressed
LTO-1	100GB	200GB	40 MB/sec
LTO-2	200GB	400GB	80 MB/sec
LTO-3	400GB	800GB	160 MB/sec	Write Once Read Many (WORM) cassettes available.
LTO-4	800GB	1.6TB	240 MB/sec	Write Once Read Many (WORM)  cassettes available.
LTO-5	1.5TB	3TB	280 MB/sec	1. Write Once Read Many cassettes available. 2. All tapes include partitioning feature that allows one partition to hold the index, which tells the drive exactly where a file is located. The second partition holds the content.

The future generations of
LTO will offer what you probably expected, a higher amount of capacity and
faster data transfer speed. Here’s what you can look forward to in the years
to come:

• Generation
  6: 8 TB capacity and data transfer speed up to 525 MB/s
  
  
• Generation
  7: 16 TB and data transfer speed up to 788 MB/s
  
  
• Generation 8: 32 TB and data transfer speed up to
  1,1180 MB/s