The current LTO Ultrium roadmap shows capacities up to.
The LTO 7 data cartridge utilizes the same form factor as LTO products. The LTO 7 data cartridge extends native capacities to 6TB (15TB compressed), more than doubling the capacity of its predecessor, LTO 6 (6.25TB compressed).
A cleaning tape can be used only for a certain number of cleaning cycles that is declared on its cover, before it looses its capacity to clean. LTO 7 is the seventh generation of LTO Ultrium technology. By this same mechanism, the drive detects that its performance is degrading and signals that the heads need cleaning, which it also does preemptively after a certain number of operating hours or length of tape.Ĭleaning consists of mounting a cleaning tape, which the drive winds over the heads and thereby the tape’s surface binds and removes the debris off the heads. If the consecutive faults exceed an allowed number, the error will be declared as a hard error. The drive keeps record of those faults as a soft write or read error. This process is repeated a given number of times. A block that is immediately detected to be incorrect after writing is marked as faulty and the data is rewritten in the following block. This means, that even if two bits of a data block are faulty or have changed over time, the data can still be correctly recovered. In addition, the tape drive employs sophisticated mathematical algorithms to perform double error detections and correction. The erase head resets and realigns the magnetic medium before the write head impresses new data on it, and the read head immediately checks whether the write operation had succeeded. The cleaning head picks up most of the dust and debris that would otherwise stick to the other heads. All of those heads are in continuous operation. For this purpose it in fact has four heads ordered one behind the other: the cleaning head, the erase head, the write head and the read head. The tape drive is a sophisticated piece of equipment that is optimized to reliably store and retrieve the data in spite of the adverse operating conditions. After a while, the transmission of the data information between the head and the tape degrades. The tape’s movement over the head creates friction while in addition dust and debris particles off the tape’s surface are honing the head and collecting and building a layer on its surface. In contrast, the tape drive’s head and the tape are in direct contact, while the tape is sweeping with high speed over the head. While reading or writing data, the disks are quickly spinning and the magnetic heads are not in direct contact with the disks, but are separated by a thin layer of air in between. A hard drive is produced in a super-clean dust-free environment and the disks that are coated with the magnetic film are enclosed in a hermetically sealed encapsulation. Disk and tape drives both use a thin magnetic film layer to store Bits of your data, which are impressed on this film via a magnetic read/write head.
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