HP 50g & SD Cards: Performance, Format, Notes

[Claudio L.]

(07-22-2016 02:43 AM)JDW Wrote:  But that PNY card was only the 3rd fastest in Joe's test.

True, but the write speed of the 50g OS has many other factors. If the card can write 2MB/s, it should do 40k in 0.02s (did I do the numbers right?), you could triple that if you consider writing to the FAT and updating the directory entry with the new modified date, so let's say 0.06s. You also need to read the entire directory to find conflicting names, add 0.20s for that if you want. The rest of those 1.8sec is the 50g OS overhead.
I wish the same test could be done using SDLIB:

http://www.hpcalc.org/details.php?id=6524

To show how long it takes to write a 40k and 200k file on each card.