Patent ID: 7490198
Filing Date: 2009-02-10
Classification: G06K

Abstract:
1. A data storage apparatus to be removably attached to a host apparatus, comprising: a plurality of nonvolatile memories in which no data is erased even after the data storage apparatus is removed from the host apparatus; a first switch which has a plurality of contacts, which is configured to be operated by a user to select one of the contacts, and which is configured to select one of the nonvolatile memories which corresponds to the contact selected; a second switch which has contacts, one of which is selected when the first switch is operated; an interface unit which is configured to supply and receive data to and from the host apparatus while the data storage apparatus remains attached to the host apparatus; and a controller which is configured to operate in accordance with data transmitted through the interface unit and which is configured to write and read data into and from one nonvolatile memories that has been selected by operating the first switch, wherein the interface unit has a detecting terminal which is configured to make the host apparatus determine that the apparatus is attached to the host apparatus; the first switch has a contact configured to select none of the nonvolatile memories, at a midpoint between a contact configured to select one nonvolatile memories and a contact configured to select another nonvolatile memories; and the second switch is configured to connect the detecting terminal to ground while the first switch is selecting any one of the nonvolatile memories, and is configured to open the detecting terminal while the first switch is selecting none of the nonvolatile memories.