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122
M16 Camera Manual: Operating The Camera
3.5 MicroSD Card Recording
3.5.1 Introduction
Flash-based storage devices (MicroSD cards, USB sticks and solid-state
drives) do not contain any moving parts as compared to the com-
monly 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 ash
device is limited. The controller of the ash device automatically
detects individual ash 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 constantly monitor activated ash storage devices. MOBOTIX
has developed a technology to test the wear of the ash device by logging the number of
write/delete cycles (patent pending). The ash 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.
ConservativeMemoryUsageThankstoMOBOTIXMxFFSFileSystem
MxFFS formatting of the MicroSD card means that the MOBOTIX camera soware will use
the ash 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 ash device will be
written and deleted with the same frequency, if possible. MOBOTIX technology increases
the life of the ash device considerably and also improves the security and the reliability
of the storage process.
StorageRequirementsandLifeExpectancyofMicroSDCards
The life expectancy of a MicroSD card increases proportionally to the storage capacity,
since the camera soware will execute fewer write/delete cycles on each storage cell.
The rst deletion will begin once the SD card has been lled to capacity (rst full cycle).
More robust than hard
drives: Flash drives
for recordings
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