multichannel linear recording (MLR)

Multichannel Linear Recording (MLR) is inextricably linked to Tandberg Data, who developed this technology. MLR replaces Scalable Linear Recording(SLR) and is a further development of QIC (Quarter Inch Cartridge). Like Travan, the technology is a multitrack technology built on the QIC format.

In Multichannel Linear Recording, the magnetic tape has defined reference tracks, so-called servo tracks, in addition to the recording tracks. The servo tracks, which are applied by the manufacturer, serve as a reference point for the read/write head so that even minimal deviations can be readjusted when the tape flutters. An additional read head in the head unit reads the servo tracks and evaluates them. A correction signal is derived from the reference signal, which is used to position the read/write head by a few micrometers in milliseconds. The head unit is made up of four write heads and eight read heads.

Currently, MLR technology offers a storage capacity of 16 gigabytes( GB) in the MLR-1 version and 26 GB (compressed) with MLR-3. The access times are 65 s, the data transfer rate is 1.5 MB/s with MLR-1 and 2 MB/s with MLR-3.

Multichannel Linear Recording (MLR) is mainly used in the professional sector because it guarantees a very high level of security. Tape libraries with capacities from 130 GB up to 1 terabyte( TB) can be built with MLR drives.