Granted Patent B1

US 9,530,436 · App. 13/162,863 · Granted Dec 27, 2016

Abstract

Claims (28)

1. A data storage device configured for shingled data writing, comprising:

a storage media including a disk; and

a controller configured to:

receive a write command including a logical address and new user data associated with the logical address;

write the new user data to a new physical address on the storage media;

determine an old physical address associated with the logical address, the old physical address containing old user data associated with the logical address;

identify a circular band of the disk comprising a track including the old physical address and one or more adjacent tracks;

perform garbage collection on the circular band in response to the receipt of the write command at least in part by reading valid data stored in the one or more adjacent tracks of the circular band, temporarily storing the valid data in a buffer, and rewriting the valid data to a different physical location of the disk;

overwrite the circular band including the old user data after said performing garbage collection; and

send a write completion status associated with the write command to a host only after determining that said writing the new user data to the new physical address, said rewriting the valid data in the buffer to a different physical location of the disk, and said overwriting the circular band including the old user data were successful;

wherein the new physical address and the old physical address are different.

2. The data storage device of claim 1 , wherein the controller is further configured to coalesce the valid data after reading the valid data stored in the one or more adjacent tracks of the circular band and before rewriting the valid data to the different physical location of the disk.

3. The data storage device of claim 1 , wherein the storage media further comprises non-volatile semiconductor memory.

4. The data storage device of claim 1 , wherein the controller is further configured to maintain an address table mapping logical addresses to physical addresses and update the address table to reflect an association between the logical address and the new physical address after identifying the circular band.

5. The data storage device of claim 1 , wherein the controller is further configured to overwrite the old user data when a secure write setting in the controller is enabled by the host.

6. The data storage device of claim 1 , wherein the controller is further configured to overwrite the old user data when the write command includes a secure write command.

7. A method of secure writing on a storage media including a disk, the method comprising:

receiving a write command from a host including a logical address and new user data associated with the logical address;

writing the new user data to a new physical address on a storage media including a disk;

determining an old physical address of the storage media associated with the logical address, the old physical address containing old user data associated with the logical address;

identifying a circular band of the disk comprising a track including the old physical address and one or more adjacent tracks;

performing garbage collection on the circular band in response to receiving the write command at least in part by reading valid data stored in the one or more adjacent tracks of the circular band, temporarily storing the valid data in a buffer, and rewriting the valid data to a different physical location of the disk;

overwriting the old user data in the circular band after said performing garbage collection; and

sending a write completion status associated with the write command to a host only after determining that said writing the new user data to the new physical address, said rewriting the valid data in the buffer to a different physical location of the disk, and said overwriting the old user data in the circular band were successful;

wherein the new physical address and the old physical address are different.

8. The method of claim 7 , wherein the storage media further comprises non-volatile semiconductor memory.

9. The method of claim 7 , wherein the overwriting the old user data is performed when a secure write setting in a controller associated with the storage media is enabled by the host.

10. The method of claim 7 , wherein the overwriting the old user data is performed when the write command includes a secure write command.

Assignments (8)