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4. External tape storage
Images recorded to the internal disk can be automatically archived to Hewlett
Packard DDS. This allows a ‘tape-a-day’ recording solution, similar to that of a
multiplexer and VCR. The disk size does not have to be large when using tapes to
archive images, although the disk size determines what is instantly accessible from
the BX2.
To play back images recorded to tape you will need to use a second tape unit
connected to a Windows™ PC. PC playback* software is required to play back
the images on the PC.
Note:
Due to the mechanical wear of tape drives and tapes we have found that
they are not generally as reliable as using disk and RAID storage alone, therefore we
would not recommend using tape storage unless there is no other option available.
The table below shows the number of hours a tape will last for when used at
different record rates (at S-VHS images quality, 18KB)
See Appendix 1 for details of configuring BX2 for tape archiving.
* PC playback software is provided with the unit
3hr
12hr
24hr
48hr
72hr
168hr
HP DDS-3 12GB
25PPS
14PPS
7PPS
3PPS
2PPS
1PPS
HP DDS-4 20GB
25PPS
23PPS
11PPS
5PPS
3PPS
1PPS
Connecting multiple external devices
Up to seven storage devices can be daisy chained from the SCSI port on the rear
of the BX2. Each device must have a unique address and the last device on the
chain must be terminated, check with the device documentation for details of
addressing and termination.
Note:
Only one tape drive can be connected to the SCSI bus.
The table below gives capacity and typical uses of each storage device.
External storage
Capacity
Description
Typical use
RAID
Currently up to
Disk array with
Longer term storage
375GB*
fault tolerance
with instant access
CD-R
640MB
Removable media
Clip storage
Hewlett Packard
12GB
Digital storage tape
Long term
DDS-3
tape-a-day archive
Hewlett Packard
20GB
Digital storage tape
Long term
DDS-4
tape-a-day archive
* Single RAID capacity, up to 7 RAIDs can be connected to BX2.
Summary of Contents for BX2
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