Purge operations for solid-state storage devices

1. A storage system, comprising:

a memory array comprising a plurality of non-volatile solid-state storage devices; and

a controller configured to write data to, and read data from, the memory array in response to commands received from a host system, and being capable of purging a variable number of said solid-state storage devices in parallel;

wherein the controller implements a command set that enables the host system to initiate a purge operation in which the memory array is purged, and to control how many of the solid-state storage devices are purged at a time during the purge operation, such that both an amount of time and a current level used to perform the purge operation are controllable by the host system.

2. The storage system of claim 1 , wherein the controller is capable of performing the purge operation at the following rates, at least: 1 solid-state storage device at a time, 2 solid-state storage devices at a time, and 4 solid-state storage devices at a time.

3. The storage system of claim 2 , wherein the controller is capable of performing the purge operation at a rate of 8 solid-state storage devices at a time.

4. The storage system of claim 1 , wherein the command set comprises an ATA command set that includes at least one vendor specific command through which the host system specifies the number of solid-state storage devices to be purged at a time.

5. The storage system of claim 1 , wherein the purge operation is a destructive purge operation that renders the storage system inoperable.

6. The storage system of claim 1 , wherein the purge operation is an erase operation in which the memory array is erased.

7. The storage system of claim 1 , wherein the purge operation is a sanitize operation in which a predetermined pattern is written to the memory array.

8. A system configured to reduce unauthorized data recovery, the system comprising;

a host system; and

a storage system that stores data for the host system, the storage system comprising:

a memory array comprising a plurality of solid-state storage devices; and

a controller configured to purge two or more of the solid-state storage devices in parallel, wherein the controller purges the two or more solid-state storage devices in response to receiving a predetermined sequence of commands from the host system, the predetermined sequence of commands including two or more commands from the host system reserved for a purge operation so that a purge operation is not inadvertently initiated.

9. The system of claim 8 , wherein the controller implements a command set that enables the host system to initiate a purge operation in which the plurality of solid-state storage devices are purged, and to specify how many of the solid-state storage devices are to be purged at a time during the purge operation.

10. A system configured to reduce unauthorized data recovery, the system comprising;

a host system; and

a storage system that stores data for the host system, the storage system comprising:

a memory array comprising a plurality of solid-state storage devices; and

a controller configured to purge two or more of the solid-state storage devices in parallel, wherein the controller purges the two or more solid-state storage devices in response to receiving a predetermined sequence of commands from the host system,

wherein the controller implements a command set that enables the host system to initiate a purge operation in which the plurality of solid-state storage devices are purged, and to specify how many of the solid-state storage devices are to be purged at a time during the purge operation,

wherein the purge operation is a destructive purge operation that renders the storage system inoperable.

11. The system of claim 9 , wherein the purge operation is an erase operation in which the memory array is erased.

12. The system of claim 9 , wherein the purge operation is a sanitize operation in which a predetermined pattern is written to the memory array.

13. A system configured to reduce unauthorized data recovery, the system comprising;

a host system; and

a storage system that stores data for the host system, the storage system comprising:

a memory array comprising a plurality of solid-state storage devices; and

a controller configured to purge two or more of the solid-state storage devices in parallel, wherein the controller purges the two or more solid-state storage devices in response to receiving a predetermined sequence of commands from the host system,

wherein the controller is capable of selecting a variable number of said solid-state storage devices to purge in parallel based, at least in part, on an availability of power to perform a purge operation.

14. A method of inhibiting access to data, comprising:

generating command data that specifies a purge operation for purging a solid-state memory array of a storage system, wherein the command data specifies how many solid-state storage devices of the memory array are to be purged at a time during the purge operation; and

sending the command data to the storage system to cause the storage system to perform the purge operation;

wherein, by specifying how many of the solid-state storage devices are to be purged at a time, the command data controls an amount of time and a current level used to perform the purge operation.

15. The method of claim 14 , wherein the purge operation is a destructive purge operation that renders the storage system inoperable.

16. The method of claim 14 , wherein the purge operation is an erase operation in which the memory array is erased.

17. The method of claim 14 , wherein the purge operation is a sanitization operation in which a pattern in written to multiple solid-state storage devices in parallel.

18. The method of claim 14 , wherein the command data is formatted in accordance with an ATA specification.

19. A computer program which, when executed by a host computer, causes the host computer to perform the method of claim 14 , said computer program represented in computer storage.