Quantum's LTO-4 HH tape drive is a half-height tape drive. Its simple space saving half-height form factor uses the industry standard interface - Serial Attached SCSI (SAS) - to allow for easy installation and integration into your datacenter. Quantum's LTO-4 HH tape drives also protect your investment by providing backward read and write. And with Quantum's LTO-4 HH drives, security is at its highest level as drives feature AES 256-bit data encryption. Encryption on LTO-4 HH tape drives is hardware based, allowing for the highest level of security without any loss of performance during the encryption process.