Storage device presenting to hosts only files compatible with a defined host capability

• US 8,239,395 B2
• Filed: 12/26/2008
• Issued: 08/07/2012
• Est. Priority Date: 12/26/2008
• Status: Active Grant

• Current Assignee: Western Digital Israel Limited (Western Digital Corporation)
• Original Assignee: SanDisk IL Ltd. (Western Digital Corporation)
• Inventors: Fruchter, Ari Daniel, Hahn, Judah Gamliel, Bryant-Rich, Donald Ray, Goodman, Daniel Isaac
• Primary Examiner(s): Lewis, Alicia
• Application Number:
  US12/344,373
• Publication Number:
  US 20100169393A1
• Time in Patent Office: 1,320 Days
• Field of Search: None
• US Class Current: 707/757
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0622 in relation to access
• CPC Class Codes: G06F 3/0637 Permissions
• CPC Class Codes: G06F 3/0643 Management of files
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

A method includes defining a host capability; creating for a storage device a second directory tree from a first directory tree of the storage device that is included in a file system within the storage device; and, for a data file that is stored in the storage device and is selectable for consumption by a host through the first directory tree that is included in the storage device'"'"'s file system, determining whether the data file requires for consumption a host having the defined host capability. If the data file requires a host having the defined host capability, an entry is created in the second directory tree in which the data file is not selectable for consumption by the host. Otherwise, an entry is created in the second directory tree in which the data file is selectable for consumption by the host.

Claims

1. A method of presenting a view of a file system of a storage device to a host, the method comprising:

determining, by a storage device, whether a host has a defined capability;

in response to the host having the defined capability;

accessing a first directory tree file stored at the storage device to present a view of a file system of the storage device to the host, wherein the first directory tree file identifies multiple files stored at the storage device; and

providing the first directory tree file to the host; and

in response to the host not having the defined capability;

accessing a second directory tree file stored at the storage device, wherein the second directory tree file identifies a subset of files of the multiple files, wherein the subset of files includes a first data file of the multiple files that does not require the defined capability and the second directory tree file makes the first data file selectable for consumption by the host, wherein the subset of files does not include a second data file of the multiple files, the second data file requiring the defined capability, and wherein the second directory tree file does not make the second data file selectable for consumption by the host; and

providing the second directory tree file to the host.

2. The method of claim 1, wherein the second directory tree file is a modified copy of the first directory tree file, wherein an entry from the first directory tree file has been altered in the second directory tree file, the entry corresponding to the second data file.

3. The method of claim 1, wherein the second directory tree file is an administrative file in the storage device.

4. The method of claim 1, wherein the second data file is rendered non-selectable for consumption by the host by the second file being designated as hidden in the second directory tree file.

5. The method of claim 4, wherein the second data file is designated as hidden by a file attribute of the second data file in the second directory tree file, wherein the file attribute is altered relative to a corresponding file attribute of the second data file in the first directory tree file.

6. The method of claim 1, wherein determining whether the host has the defined capability includes examination of parameters exchanged during a handshake between the host and the storage device.

7. The method of claim 1, wherein determining whether the host has the defined capability includes examination of data received from a signaling interface operatively connected to the storage device.

8. The method of claim 7, wherein the signaling interface is a push button.

9. The method of claim 1, wherein the defined capability is a communication bandwidth.

10. The method of claim 1, wherein the storage device comprises a flash storage device that includes a Universal Serial Bus (USB) interface.

11. The method of claim 1, wherein the storage device comprises a Secure Digital (SD) card.

12. The method of claim 1, wherein the second directory tree file is created by:

defining a host capability to generate the defined capability;

accessing an entry of the first director tree file, the entry corresponding to particular data file that is stored at the storage device;

determining whether the particular data file requires the defined capability;

when the particular data file requires the defined capability, creating an entry for the particular data file in the second directory tree file such that the particular data file is not selectable for consumption via the second directory tree file; and

when the particular data file does not require the defined capability, creating an entry in the second directory tree file such that the particular data file is selectable for consumption via the second directory tree file.

13. The method of claim 1, wherein the second data file is rendered non-selectable for consumption by the host by a file name of the second file in the second directory tree file being altered relative to a file name of the second file in the first directory file tree.

14. The method of claim 1, wherein the second data file is rendered non-selectable for consumption by the host by a file type of the second file indicated by the second directory tree file being altered relative to a file type of the second file indicated by the first directory file tree.

15. The method of claim 1, wherein the second data file is rendered non-selectable for consumption by the host by an address of the second file specified by the second directory tree file being altered relative to an address of the second file specified by the first directory file tree.

16. The method of claim 1, wherein the defined capability is an ability to use a particular file format.

17. The method of claim 1, wherein the defined capability is an ability to playback data files at a specified bit rate.

18. The method of claim 1, wherein the defined capability is supporting a Universal Serial Bus (USB) high-speed connection.

19. The method of claim 1, wherein the defined capability is an ability to playback particular data files, wherein the first data file requires a first playback quality level and the second data file requires a second playback quality level.

20. A storage device comprising:

a non-volatile memory including a file system stored in the non-volatile memory; and

a controller coupled to the non-volatile memory and configured to determine whether a host has a defined capability;

wherein in response to the host having the defined capability, the controller is configured to;

access a first directory tree file stored at the storage device to present a view of the file system of the storage device to the host, wherein the first directory tree file identifies files stored at the storage device; and

provide the first directory tree file to the host; and

wherein in response to the host not having the defined capability, the controller is configured to;

access a second directory tree file stored at the storage device, wherein the second directory tree file identifies a subset of the files stored at the storage device, wherein the subset includes, a first data file that does not require the defined capability and the second directory tree file makes the first data file selectable for consumption by the host, wherein the subset does not include a second data file, the second data file requiring the defined capability, and wherein the second directory tree file does not make the second data file selectable for consumption via the host; and

provide the second directory tree file to the host.

21. The storage device of claim 20, wherein the controller is further configured to render the second data file non-selectable for consumption by the host by storing in the second directory tree file a specific address of a first memory cluster of the second data file that is different than a corresponding address of the second data file in the first directory tree file.