| 摘要 |
PROBLEM TO BE SOLVED: To prevent an access operation from becoming unstable due to the increase of an area of overwrite prohibiting process by input of an alarm or specified operation, in the case image data are overwritten and recorded on a recording medium with an endless system like an image recorder of a monitoring system. SOLUTION: When the alarm is input (S4), a ratio Rw of the data amount of overwritable area: Vo-(Va+Vp) [Va is data amount of already set overwrite prohibiting area, Vp is estimated data amount of an overwrite prohibiting area to be set this time] to a total recording capacity Vo of the recording medium (HDD) is obtained (S5). When Rw is larger than a predetermined threshold: Rth, the substitute prohibiting process is carried out (S7, S8), but when Rw is equal to Rth or smaller, this fact is notified by an electronic sound, etc., and also a specified emergency process is executed (S12). Also in the case the overwrite prohibiting process is added by a post specified operation, a determination is made whether the overwrite prohibiting process is carried out, or the notification and emergency process are carried out, according to the same principle. COPYRIGHT: (C)2008,JPO&INPIT
|
