Disk Contents

Standard Disk File Overwrite Mechanism

AI Alert Attachments (AS Directory)

• Each disk is processed separately;
• A check for the maximum number of files is performed every 10 minutes; if the limit (3,600 files) is exceeded, the oldest files exceeding the limit are overwritten;
• A check for remaining disk space is performed every minute; if disk space falls below 200 MB, the oldest files from the past 30 minutes are deleted in a single operation;
• At least 20 files must be retained and cannot be deleted;

Snapshot Images (picture directory)

• Each disk is processed separately;
• Images subject to overwriting include those captured via alarm triggers, scheduled snapshots, etc.;
• Checks for expiration (menu parameter) every 10 minutes; the unit is days. When expired, deletes all images from that day in one go;
• Check available disk space every 1 minute; when disk space falls below 200 MB:
  • Delete the oldest files from the past hour at a time:
  • If only files from the most recent hour remain, delete a maximum of 4 sets of files at a time, retaining at least 2 sets;
  • Retain at least one hour’s worth of images;

Alarm Recording Protection Files (REC-ALARM directory)

• Process each disk separately;
• Check for expiration (menu parameter) every 10 minutes, measured in days; when expired, delete all files from that day in one go;
• Check available disk space every 1 minute; when disk space falls below 200 MB:
  • Delete files from the oldest day at a time:
  • If only files from the most recent day remain, delete a maximum of 4 sets of files at a time, retaining at least 2 sets;
  • Files from at least 1 day must be retained and cannot be deleted;

Log Files (debug directory)

• Process each disk separately;
• Check for expiration (90 days) every 10 minutes (in days); when expired, delete all files for that day in one go;
• Check available disk space every minute; when disk space falls below 200 MB, delete one oldest file at a time;
• At least one file must be retained and cannot be deleted;
• For log files on flash storage media, when a recording disk is available (and disk space exceeds 200 MB), move all files to the standard partition on the recording disk; do not delete files from the flash storage;
• When flash storage space falls below 20% (for flash storage media), perform an expiration check and delete files; if space remains below 20%, continue deleting the oldest file one at a time;

Collision Alarm Cache Video Files (AlarmRecCache2Disk directory)

• Emergency alarm videos are 10-second clips stored in the internal flash;
• When a recording disk is present, move the short clips to the standard partition on the recording disk and delete the files from the flash memory;
• When a USB drive is inserted, export the short clips from the flash memory or recording disk to the USB drive;
• When the flash storage space is less than 20% (flash storage medium), delete the oldest file at a time;
• Check remaining disk space every minute (recording disk); when disk space falls below 200 MB, delete the oldest file one at a time;
• At least two files must be retained and cannot be deleted;

Deletion Mechanisms for Different File Types

• When disk space exceeds 200 MB, files are overwritten according to their respective overwrite mechanisms;
• When disk space is less than 200 MB, files of each type are overwritten in rotation: AI files delete one half-hour file at a time, image files delete one 1-day or 1-hour file at a time, protected alarm video files delete one 1-day or several sets of files at a time, log files delete one file at a time, and collision/emergency alarm cache files delete one file at a time;