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Write protection for computer long-term memory devices

DC
  • US 6,813,682 B2
  • Filed: 09/25/2001
  • Issued: 11/02/2004
  • Est. Priority Date: 09/29/2000
  • Status: Expired due to Term
First Claim
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1. A blocking device comprising:

  • an interface emulator configured to emulate an interface presented by a storage device and configured to connect to a host;

    an interface for connecting to the storage device; and

    a processor coupled to the interface emulator and the interface, the processor examining commands received through the interface emulator that are generated by the host and intended for the storage device, the processor allowing only those of the commands that match a predetermined set of commands to pass to the storage device via the interface, the predetermined set of commands being commands that are known to not permanently modify a state of the storage device, wherein the blocking device is transparent to normal operation of the host and the storage device.

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