. LTO-4 features doubled capacity compared to the LTO-3 offering 800GB native or 1.6TB with 2 1 data compression. Performance is also improved with a transfer rate of 240MB/s. This boost in performance is not the only advancement LTO-4 incorporates additional support for advanced data protection and security features. LTO-4 will continue to support the write-once read-many (WORM) functionality seen in the LTO-3 and will now support 256-bit AES encryption. Manufacturer - IBM. Type - Storage Media LTO Ultrium. Native Capacity - 800 GB. Compressed Capacity - 1.6 TB. Recording Standard - Ultrium 4. Quantity - 1.