Appendix B. PC/CF Card Information
found that SLC outperformed MLC, offering greater durability, running 300%
faster in write mode, and 43% faster in read mode. While MLC Flash
increases the overall density of data storage, which therefore decreases cost; it
does so at the expense of data reliability, performance and memory
management. Furthermore, MLC technology is more prone to failure, data
corruption, or incorrect reading due to memory cell degradation from the
additional energy required during operations
2
.
There are two types of CF cards available today: Industrial grade and Standard
or Commercial grade. Industrial grade PC/CF cards are held to a higher
standard; specifically they operate over a wider temperature range, offer better
vibration and shock resistance, and have faster read/write times than their
commercial counterparts (Table B-3). The Industrial Grade cards more closely
match the operating envelope of the dataloggers, and for this reason we
recommend you always use extended temperature tested, Industrial Grade
PC/CF cards with a datalogger.
TABLE B-3. Comparison of Industrial and Commercial Grade Cards
Industrial Grade
Cards
Commercial Grade
Cards
Operating Temperature
-40 to +85ºC
0 to +70ºC
Vibration Proofing
30 Gs
15 Gs
Shock Resistance
2000 Gs
1000 Gs
MTBF
>3,000,000 hours
>1,000,000 hours
Type of NAND Flash Memory
SLC MLC
typically
but some SLC
All Campbell Scientific products are Electrostatic Discharge (ESD) tested to
ensure that in the event of a static discharge neither the equipment nor the data
is damaged or lost. Campbell Scientific ESD tested several brands of cards,
only the Silicon Systems cards passed this testing. Campbell Scientific
recommends that only Silicon Systems cards be used with Campbell Scientific
CRBasic dataloggers. It is not necessary to purchase the cards directly from
Campbell Scientific, as long as the Silicon Systems card model number
matches Table B-4.
TABLE B-4. Silicon Systems and Campbell Scientific
PC/CF Model Numbers
Card
Type
Size
(Mbytes)
Silicon Systems
(model number)
Campbell Scientific
(model number)
CF 64 SSD-C64MI-3038 CFMC64M
CF 256 SSD-C25MI-3038 CFMC256M
CF 1024 SSD-C01GI-3038
CFM1GM
CF 2048 SSD-C02GI-3038
Not
Available
PC 1024 SSD-P01GI-3038
Not
Available
PC 2048 SSD-P02GI-3038
Not
Available
B-2
Summary of Contents for NL115
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