Patent ID: 8767340

Claim:
A device comprising: read/write channel signal processing circuitry to couple with a read/write head to write servo information on a storage medium using a first spiral set and a second spiral set different from the first spiral set; and a controller coupled with the read/write channel signal processing circuitry configured to: identify one or more switch locations on the storage medium; control the read/write head to track follow on the first spiral set; detect the one or more switch locations on the first spiral set while the read/write head track-follows on the first spiral set; determine if a timing conflict exists between the read/write head writing the servo information and reading out data from the first spiral set; control the read/write head to track-follow on the second spiral set if the timing conflict exists; and detect an end of a band of spirals comprising the first spiral set and the second spiral set based on a comparison of one or more detected characteristics of the first spiral set and the second spiral set.