The invention relates to a system and method for remote activation of a storage operation of pictorial information. According to the invention, it involves a wearable sensor device, comprising at least one sensor, a processing unit, a memory unit, and a wireless signaling unit for communicating with external devices over a wireless link by means of one-way transmission of information. A second device comprises a recording apparatus adapted to be set in a mode of continuous capture of pictorial information, a memory, and a wireless signaling system for communicating with external devices over a wireless link. The processing unit in the wearable sensor device is adapted, based on sensor signals received from said at least one sensor, to send commands over the wireless link to the second digital device to trigger, in response to said commands, storage of at least part of said continuously captured pictorial information.

The invention relates to a system and method for remote activation of a storage operation of pictorial information. According to the invention, it involves a wearable sensor device, comprising at least one sensor, a processing unit, a memory unit, and a wireless signaling unit for communicating with external devices over a wireless link by means of one-way transmission of information. A second device comprises a recording apparatus adapted to be set in a mode of continuous capture of pictorial information, a memory, and a wireless signaling system for communicating with external devices over a wireless link. The processing unit in the wearable sensor device is adapted, based on sensor signals received from said at least one sensor, to send commands over the wireless link to the second digital device to trigger, in response to said commands, storage of at least part of said continuously captured pictorial information.

A digital information recording apparatus includes a recording circuit for recording information of a retention period included in the digital information and indicating a period for permitting the digital information to be held in the recording medium, starting with a time at which the digital information is recorded on the recording medium; and information of a playback permission period included in the digital information and indicating a period for permitting the digital information to be played back starting with a time at which the information is reproduced initially following recording of the digital information on the recording medium, permitting temporary recording or copying for the information permitted for copy never or copy one generation.

A digital information recording apparatus includes a recording circuit for recording information of a retention period included in the digital information and indicating a period for permitting the digital information to be held in the recording medium, starting with a time at which the digital information is recorded on the recording medium; and information of a playback permission period included in the digital information and indicating a period for permitting the digital information to be played back starting with a time at which the information is reproduced initially following recording of the digital information on the recording medium, permitting temporary recording or copying for the information permitted for copy never or copy one generation.

A magnetic disk device according to an embodiment includes a disk including a plurality of tracks, a head configured to write and read data to and from the disk, and a controller configured to control an off-track of the head, which occurs when data is written to one track included in the plurality of tracks, within an allowable range of an amount of the off-track, which is set based on a count value of at least another track other than the one track.

The invention relates to a system and method for remote activation of a storage operation of pictorial information. According to the invention, it involves a wearable sensor device, comprising at least one sensor providing sensor signals, a processing unit for running computer programs, a first memory unit for storing instructions for said computer programs and a wireless signaling unit for communicating with external devices over a wireless link. The system further comprises at least one second digital device comprising a recording apparatus adapted to be set in a mode of continuous capture of pictorial information, a second memory unit, and a wireless signaling system for communicating with external devices over a wireless link. The processing unit in the wearable sensor device is adapted to send commands over said wireless link by means of one-way transmission to said second digital device to trigger, in response to said commands, storage of at least part of said continuously captured pictorial information in the memory of said at least one second device.

A magnetic disk device according to an embodiment includes a disk including a plurality of tracks, a head configured to write and read data to and from the disk, and a controller configured to control an off-track of the head, which occurs when data is written to one track included in the plurality of tracks, within an allowable range of an amount of the off-track, which is set based on a count value of at least another track other than the one track.

A magnetic disk device according to an embodiment includes a disk including a plurality of tracks, a head configured to write and read data to and from the disk, and a controller configured to control an off-track of the head, which occurs when data is written to one track included in the plurality of tracks, within an allowable range of an amount of the off-track, which is set based on a count value of at least another track other than the one track.