Device for detecting whether an attached external memory stores valid data, if not, whether the external memory is capable of storing data
First Claim
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1. A data processing device adapted to attachably and detachably couple with an external memory unit to which data are written and from which data are read, said external memory unit storing data even when not coupled to said data processing device, said data processing device comprising:
- discriminating means for determining whether said external memory unit is coupled to said data processing device;
judging means for judging if a predetermined kind of data are stored in said external memory unit when said discriminating means determines that said external memory unit is coupled to said data processing device;
another judging means for judging if said predetermined kind of data stored in said external memory unit are usable when said judging means judges that said predetermined kind of data are stored in said external memory unit, said another judging means including means for performing a sum check on said predetermined data and comparing said sum check result with a sum result stored in said external memory unit;
error indicating means for indicating that said predetermined kind of data are not usable when said another judging means judges that said predetermined kind of data are not usable; and
,third judging means for judging whether said external memory unit is capable of storing data when said judging means judges that said predetermined kind of data are not stored in said external memory unit, said third judging means including means for writing test data to said external memory unit, means for reading said test data from said external memory unit and means for comparing said test data read from said external memory unit with said known test data whereby to check the integrity of said external memory unit.
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Abstract
In a data processing device capable of attachably and detachably providing an external memory unit to which data are written and from which data are read, the external memory unit being capable of storing data even when it is not provided on the data processing device, provided are discriminating means for discriminating whether the external memory unit is provided on the data processing device, judging means for judging whether predetermined kind of data are stored in the external memory unit in case that it is discriminated that the external memory unit is provided on the data processing device, and another judging means for judging at least whether the predetermined kind of data stored in the external memory unit are operable in case that it is judged by the judging means that the predetermined kind of data are stored in the external memory unit. Thus, since a conventional check operation for the external memory unit is not executed, in the data processing device according to the present invention, when the predetermined kind of data are stored, the predetermined kind of data are not destroyed.
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Citations
13 Claims
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1. A data processing device adapted to attachably and detachably couple with an external memory unit to which data are written and from which data are read, said external memory unit storing data even when not coupled to said data processing device, said data processing device comprising:
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discriminating means for determining whether said external memory unit is coupled to said data processing device; judging means for judging if a predetermined kind of data are stored in said external memory unit when said discriminating means determines that said external memory unit is coupled to said data processing device; another judging means for judging if said predetermined kind of data stored in said external memory unit are usable when said judging means judges that said predetermined kind of data are stored in said external memory unit, said another judging means including means for performing a sum check on said predetermined data and comparing said sum check result with a sum result stored in said external memory unit; error indicating means for indicating that said predetermined kind of data are not usable when said another judging means judges that said predetermined kind of data are not usable; and
,third judging means for judging whether said external memory unit is capable of storing data when said judging means judges that said predetermined kind of data are not stored in said external memory unit, said third judging means including means for writing test data to said external memory unit, means for reading said test data from said external memory unit and means for comparing said test data read from said external memory unit with said known test data whereby to check the integrity of said external memory unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A printing device, comprising at least an internal memory unit for storing data to be printed and a printing mechanism for printing at least the data stored in said internal memory unit on a printing sheet, said printing device being attachably and detachably coupled to an external memory unit to which data are written and from which data are read, said external memory unit storing data even when not coupled to said printing device, said printing device further comprising:
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discriminating means for determining whether said external memory unit is coupled to said printing device; judging means for judging if a predetermined kind of data are stored in said external memory unit when said discriminating means determines that said external memory unit is coupled to said printing device; another judging means for judging if said predetermined kind of data stored in said external memory unit are usable when said judging means judges that said predetermined kind of data are stored in said external memory unit, said another judging means including means for performing a sum check on said predetermined data and comparing said sum check result with a sum result stored in said external memory unit; error indicating means for indicating that said predetermined kind of data are not usable when said another judging means judges that said predetermined kind of data are not usable; and
,third judging means for judging whether said external memory unit is capable of storing data when said judging means judges that said predetermined kind of data are not stored in said external memory unit, said third judging means including means for writing test data to said external memory unit, means for reading said test data from said external memory unit and means for comparing said test data read from said external memory unit with said known test data whereby to check the integrity of said external memory unit. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification
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Current AssigneeBrother Kogyo Kabushiki Kaisha (Brother Industries Limited)
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Original AssigneeBrother Kogyo Kabushiki Kaisha (Brother Industries Limited)
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InventorsHayamizu, Kazuhiro
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Primary Examiner(s)Lee, Thomas C.
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Assistant Examiner(s)Harrity, Paul
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Application NumberUS07/514,702Time in Patent Office1,279 DaysField of Search395/800, 395/275, 235/380, 400/61, 365/201, 360/133, 360/135, 371/21.2US Class Current711/115CPC Class CodesG06F 11/006 Identification G06F11/2289 ...G06F 11/1004 to protect a block of data ...G06F 11/2289 by configuration testG06K 15/02 using printersG06K 2215/0025 Removable memories, e.g. ca...G11C 5/143 Detection of memory cassett...
