Accelis – 8MM Tapes, dual reel cartridge, biased toward fast access time, very similar to Sony's AIT tapes product.

Ultrium – 1/2" tape, single reel cartridge, biased toward high capacity, very similar to Quantum's DLT product and IBM's 3590 Magstar product.

As of 2006, LTO Ultrium is very popular and there are no commercially available LTO Accelis drives or media. In common usage, LTO generally refers only to the Ultrium form factor. We can find many companes in the LTO tapes production like

Sony LTO tapes, Maxell lto, Hp lto tapes, lto ultrium IV, Maxell lto tape, Sony LTO-3 tapes , Sony LTO-2 tapes.

This ultra-high capacity generation of tape storage products is designed to deliver outstanding performance, capacity and reliability combining the advantages of linear multi-channel, bi-directional formats with enhancements in servo technology, data compression, track layout, and error correction.

LTO media now available   AIT-1 Tapes,  AIT-2 Turbo Tapes,  AIT-3 Tapes,   AIT-4 Tapes,   AIT-5 Tapes,  AIT-E Turbo Tapes,  AIT Barcode Labels,  AIT-2 Tapes,  Baba Certified AIT Media