The ibm lto ultrium 4 or lto4 data cartridge 95p4436 has up to 800gb native capacity at up to 120mb/s transfer rate, and up to 1.6tb compressed capacity at up to 240 mb/s transfer rate.The ibm lto 4 tape cartridge is suitable for read and write in all lto4 ultrium4 drives, and also suitable for read/write in lto5 drives and read only in lto6 drives.