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Originally Posted by Astounded EEG
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The X standard used by the flash memory industry is the same as that used by the compact disc industry:
One "X" = 150KB/sec
Usually fast cards are only a real help if you are frequently transferring large quantities of data over a USB connection or if you are using a camera that benefits from high write speeds.
The power drain is negligible for any SD or CF card (flash memory only, not microdrive CF cards etc.).
Aside:
As for Sandisk's Ultra II card claim...186,000 miles/second is the speed of light. I'm not sure electrons can travel quite that fast yet in conventional electronics.
I tested out a 512MB Sandisk Ultra II SD card in a USB2 card reader recently, and it averaged only 7MB/sec or so. One of my 1GB normal speed Lexar SD cards wrote at 6MB/sec in a test a day or two earlier.
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The speed of light reference was an attempt at humor -- I assumed electrons traveled at the speed of light. They don't?
ScanDisk's Ultra II SD and CF cards were the only ones that had write and read speeds listed.
How did you measure the transfer speed?
I found some info on the cards:
The BIG cards were tested here:
http://www.dpreview.com/news/0310/03...biggestcfs.asp
They used the ultra II card, with speeds just over 4MB/sec.
The SanDisk Ultra II CompactFlash cards have a minimum sustained write speed of 9MB per second and a read speed of 10MB per second.
http://www.pricegrabber.com/search_t...02#description
SanDisk's Ultra CompactFlash is a line of high-speed storage cards specifically designed for use in the rapidly growing market of high-performance digital cameras.
In advanced cameras, these cards have been developed to save large image files to the card as quickly as possible so the camera will be ready to take the next picture. If features a copy/download transfer rate of up to 2.8MB/s,
http://www.pricegrabber.com/search_t...29#description
Description:SanDisk Extreme CompactFlash cards deliver a sustained write speed of up to 9 Megabytes per second and sustained read speed of 10 Megabytes per second.
http://www.pricegrabber.com/search_g...gb%20cf%20card
Yep, I've got too much time on my hands.