Metadata recovery in a disk drive

A method of storing metadata information on a data track located within a first zone of a non-volatile storage medium, the method comprising:

• receiving host data from a host system;
• storing a first write-log of a first type in a first metadata portion of the data track;
• and
• storing a write-log of a second type in a second metadata portion of the data track;
• wherein each write-log includes or is stored in association with:
• a first identifier that is unique across at least the first zone and a second zone of the non-volatile storage medium, and
• a second identifier that is unique within the first zone.

A disk drive comprising:

• a magnetic storage medium comprising a plurality of zones, each zone comprising a plurality of tracks configured to store one or more write-logs containing metadata;
• and
• a controller configured to:
• determine a physical address for a first write-log of a first type, wherein the physical address of the first write-log of the first type is located in a first zone;
• determine a physical address for a second write-log of the first type, wherein the physical address of the second write-log of the first type is located in the first zone;
• determine whether the second write-log is associated with a last write operation received from a host system prior to a power loss event;
• and
• add the second write-log of the first type to a list of recovered write-logs associated with the first zone.