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Chapter 8
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Advanced Topics
Selecting Compact Flash cards
When you use BrightSign, your content and scripts resides on a Compact Flash (CF) or Secure
Digital (SD) card. Although the CF/SD interface is standardized, there are a wide range of
performance, compatibility, and reliability issues among CF/SD card brands and models.
BrightSign strongly recommends that you use
industrial rated
CF/SD cards with BrightSign. We
have tested industrial rated CF/SD cards from the following brands:
•
Transcend
•
PQI
•
Simpletech
Avoiding CF/SD card corruption due to read fatigue
If you fail to use an industrial CF/SD card, the files on the CF/SD card may become corrupt after a
period of time. This is due to the fact that CF/SD cards use NAND flash memory chips that are
rated for a certain number of
block reads
before a particular block may develop a read error. Some
types of NAND flash are more susceptible to read errors than others. For example, multi-level
flash chips are much more susceptible to read errors than single level flash chips. CF/SD card
controllers (the chip inside the CF/SD card that controls the flash memory and interfaces with the
CF/SD connector) are responsible for eliminating these read errors as well as write errors through
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