Storage, video recording system, and method for controlling storage

A video recording system comprising:

• a storage having a flash memory having a recording area in which video is recorded, and a controller configured to control recording of the video to the flash memory;
• and
• an information processing device connected to the storage, and configured to transmit, to the storage, video to be recorded in the recording area,
• wherein the recording area is divided into a plurality of blocks, which are units of data deletion,
• the controller executes, as a standard function of the storage, a first wear-leveling process in a case where a data recording maldistribution degree has reached or exceeded a first threshold value, the first wear-leveling process bringing the data recording maldistribution degree below the first threshold value, the data recording maldistribution degree being expressed as a difference between a highest value of data recording instance counts for blocks to which the video can be recorded from among the plurality of blocks and a lowest value among the recording instance counts for all of the plurality of blocks,
• the information processing device calculates a second threshold value, which is a data recording maldistribution degree for preventing the data recording maldistribution degree from reaching the first threshold value while the video is being recorded, and
• the controller
• acquires the second threshold value from the information processing device, and
• in a case where the data recording maldistribution degree is equal to or greater than the second threshold value, executes a second wear-leveling process bringing the data recording maldistribution degree to or below the second threshold value.

A method of controlling a storage having a flash memory having a recording area in which video is recorded,

• the storage executing a first wear-leveling process in a case where a data recording maldistribution degree has reached or exceeded a first threshold value, the first wear-leveling process bringing the data recording maldistribution degree below the first threshold value, the data recording maldistribution degree being expressed as a difference between a highest value of data recording instance counts for blocks to which the video can be recorded from among a plurality of blocks included in the recording area and a lowest value among the recording instance counts for all of the plurality of blocks,
• the control method comprising:
• acquiring a second threshold value, which is a data recording maldistribution degree for preventing the data recording maldistribution degree from reaching the first threshold value while the video is being recorded;
• and
• executing, in a case where the data recording maldistribution degree is greater than the second threshold value, a second wear-leveling process bringing the data recording maldistribution degree to or below the second threshold value.