Disk drive flushing write cache to a nearest set of reserved tracks during a power failure

A method of operating a disk drive, the disk drive comprising a disk, an actuator arm, a head connected to a distal end of the actuator arm, and a ramp near an outer periphery of the disk, wherein:

• the disk comprises a plurality of data tracks and a first and second set of reserved tracks;
• and
• the first set of reserved tracks are located at a first radial location, and the second set of reserved tracks are located at a second radial location different than the first radial location;
• the method comprising:
• receiving a write command from a host, the write command comprising user data;
• storing the user data in a cache memory;
• when a power failure is detected:
• determining whether the head is nearer to the first or second set of reserved tracks;
• seeking the head to the nearest of the first and second set of reserved tracks and write the user data stored in the cache memory;
• and
• unloading the head onto the ramp.