Microsd Card Recording; Introduction - Mobotix D15 Manual

96
/112
More robust than hard
drives: flash drives
for recordings
D15 Camera Manual: Operating the Camera
3.5

MicroSD Card Recording

3.5.1 Introduction

Flash-based storage devices (MicroSD cards, USB flash drives and
solid-state drives) do not contain any moving parts as compared
to the commonly used hard drives. Flash-based storage devices
are compact and highly resistant to moisture and vibrations. They
feature low energy consumption and they do not lose any data in
the event of a power failure, meaning that they are ideal for use
with MOBOTIX cameras.
Number of Write/Delete Cycles Per Flash Storage Cell
The number of write/delete cycles of every storage cell of a flash
device is limited. The controller of the flash device automatically detects individual flash
cells that are no longer functioning. The contents of the faulty cell will then be rebuilt
using a checksum and will be moved to a properly working spare cell. The faulty storage
cell will be marked as "bad" and will no longer be used. No data is lost in this process.
In addition, MOBOTIX cameras can constantly monitor activated flash storage devices.
MOBOTIX has developed a technology to test the wear of the flash device by logging the
number of write/delete cycles (patent pending). The flash memory wear is automatically
displayed in the status bar in the live camera image but it can also be viewed at any time in the
Admin Menu > Camera Status dialog box.
Low Memory Usage Thanks to MOBOTIX MxFFS File System
MxFFS formatting of the MicroSD card means that MOBOTIX camera software will use
the flash device as evenly as possible, thus allowing for the maximum possible number
of write/delete cycles. This also means that all storage cells of the flash device will be
written and deleted with the same frequency, if possible. MOBOTIX technology increases
the life of the flash device considerably and also improves the security and the reliability
of the storage process.
Storage Requirements and Life Expectancy of MicroSD Cards
The life expectancy of a MicroSD card increases proportionally to the storage capacity,
since the camera software will execute fewer write/delete cycles on each storage cell.
The first deletion will begin once the SD card has been filled to capacity (first full cycle).
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com