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APPENDIX ELX16-240
Rugged CCTV
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#1. HDD
#1.1. Fundamental Notions & Terms
DVR Storing Constructure (VFS2)
DVR series has a peculiar storing constructure, and its features are as follows.
(1) It is possible to connect 2 sets of HDD internally (Internal, ATA Interface) and 63 sets of HDD
externally (External, 2 ports of IEEE1394).
(2) All of the connected HDDs is recognized as one virtual disk, and DVR supports upto 4TB.
(3) Hdds are divided into primary disk (connected firstly) and auxillary disk.
ATA(or EIDE) supports two channel interfaces (Primary/Secondary). Each channel can be connected to
two devices (Master/Slave, HDD/CD-ROM). However DVR supports 1 channel interface internally and
total two HDDs. In order to prevent confusing VFS2 ’s Primary Disk, we will not use the terms
(Primary/Secondary).
(4) Primary disk is composed of log partition, normal partition, and alarm partition, and auxillary disk is
composed of only normal partition. So if primary disk has some problem, all of the recorded data will
be lost.
<Note>
Log Partition To store the information of recorded data
Normal Partition To store the data as normal recording schedule
Alarm Partition To store the data as alarm recording condition (MD or Sensor)