Inter-track interference cancelation is disclosed, including: receiving an input sequence of samples associated with a track on magnetic storage; using a processor to generate inter-track interference data associated with a first side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the first side track. At least one of the slides comprises lock for steplessly locking the slide at random positions of the respective guide rail. The process can essentially be repeated to form a guard structure around each nozzle. A device to make some action on the tape cassette can thus have a higher operability and extensibility. The case body is rotatable along an axis which is in alignment with the hinges. The method also includes receiving user trajectory data and generating portal information based on the received user trajectory data that cross the border between the first and second regions.