Patent ID: 7716418

Claim:
Host device ( 20 ), capable of cooperating with a medium access device ( 10 ) suitable for reading information from a storage medium ( 2 ) which has a storage space ( 3 ) comprising blocks ( 4 ) of storage locations having addresses (PA), the medium access device ( 10 ) being of a type which automatically starts reading a next block after having read a previous block; the host device ( 20 ) being designed to send ( 5 ) commands to the medium access device ( 10 ), commanding the medium access device ( 10 ) to read one or more sectors of data from the storage medium ( 2 ); the host device ( 20 ) being designed to send a jump command JUMPm(X,Y;SAP) to the medium access device ( 10 ), for instructing the medium access device ( 10 ) to jump to block Y after having read block X, the jump command JUMPm(X,Y;SAP) including a sequential access parameter SAP; the host device being designed to set the sequential access parameter to one of a first or second value: a) in the case where the sequential access parameter SAP is set by the host device ( 20 ) to a first value to indicate to the medium access device ( 10 ) that the host device ( 20 ) deliberately signals a jump from a lower addressable block X to a higher addressable block Y, the medium access device ( 20 ) executes the jump command JUMPm(X,Y;SAP) by jumping from the lower addressable block X to the higher addressable block Y, (X<Y), and b) in the case where the sequential access parameter SAP is set by the host device ( 20 ) to a second value to indicate to the medium access device ( 10 ) that the host device ( 20 ) deliberately signals a jump from a higher addressable block X to a lower addressable block Y, the medium access device ( 20 ) executes the jump command JUMPm(X,Y;SAP) by jumping from the higher addressable block X to the lower addressable block Y, (X>Y) iii) in a case where the medium access device ( 20 ) is not designed to recognize the jump command JUMPm(X,Y;SAP): the medium access device ( 20 ) ignores the setting of the SAP parameter and execute the jump command JUMPm(X,Y;SAP) by jumping from the lower addressable block X to the higher addressable block Y, (X<Y), the medium access device ( 20 ) returns an error message in response to the jump command JUMPm(X,Y;SAP) when it is instructed to jump from the higher addressable block X to the lower addressable block Y, (X>Y).