Can I use my old Media in new tape drive ?

Yes, LTO Drive is backward compatible to 2 previous generations. Each New LTO tape drive is Read/Write compatible to the previous generation and Read-only Compatible to the generation before that. For Example LTO- 7 tape drive is RW compatible to LTO-6 and Read-Only LTO-5. This way you know that any old media you have ( upto 2 prior generations) is also compatible. The only Exception is LTO-8 Drive which is not compatible with LTO-6.