At roughly 200 um tall with a repeating frame distance of 100 um, a single servo band can provide information necessary to position many data tracks
SDLT media reserves the entire front side of the tape for data tracks
, while three optical servo tracks are pro-written on the back of the tape during the manufacturing process.
The low performance reads and writes data tracks
that are identical to those produced by higher performance Ultrium drives--it just does it more slowly.
The common method of creating servo-positioning tracks on the tape is to embed magnetic servo tracks between the data tracks
on the recording surface, reducing the physical space available to write data.
Tape media and cartridges have changed dramatically over the years, as improvements continue to be made across virtually every physical parameter of tape from the thickness of substrate and magnetic layers, size and density of magnetic particles, track width and number of data tracks
, to the length and speed of the tape within a cartridge.
Linear tape technology utilizes a recording method in which the data tracks
are written in a linear pattern on the tape.
Because Blu-ray Disc media's data tracks
are quite narrow even in comparison with DVD media, precise, stable interaction between the laser and the recording material is especially critical to ensuring error-free recording and playback.
The servo signal is a series of sine waves which provides precise feedback to control the position of the read/write head on each of the 192 data tracks
across the width of the tape.