We used HD Tach as a preliminary test of the read performance of these cards, then switched to Sandra SiSoft flash memory benchmark to test both read and write performance. I like the Sandra test suite because it tests many different file sizes on write and read speed. Both tests showed very consistent results.
Prior to our write tests, we re-formatted the cards within windows with standard cluster sizes, FAT32 for the 4GB card. With the 4GB card, going from 4kb to 32kb clusters did not have a significant effect on performance. We did not test the write performance with the Lexar card.
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