MEDIUM FOR INSPECTING MAGNETIC STORAGE DEVICE

PURPOSE:To easily adjust a VFO data separation circuit even without using a specific facility by setting the data pulse time interval of a synchronizing part in a data part area at a range outside the capture range and the lock range of a variable frequency oscillator VFO. CONSTITUTION:Plural address part areas 4, 12... and data part areas 8, 16... are provided on the same track on a storage medium, and the synchronizing parts 6, 14... in which the time intervals T3, T7... of read data pulse with equal intervals being used in the synchronization of the VFO in the leading part of the data part areas 8, 16... change corresponding to address information is provided. And when an insufficient time interval required for the synchronization of the VFO is set on the data pulse time interval of the leading part of a 2N-th or a 2(N+1)-th data part area (outside the capture range and the lock range), a reading margin is decreased, and the separation of a data pulse from a clock pulse is not performed accurately. In such a way, the adjustment can be performed easily by setting the data pulse time interval of the synchronizing part in the data part area at the range outside the capture range and the lock range of the VFO.