OESF Portables Forum

Everything Else => Sharp Zaurus => Model Specific Forums => Distros, Development, and Model Specific Forums => Archived Forums => C1000/3x00 General discussions => Topic started by: danboid on July 04, 2006, 01:54:54 pm

Title: Have I Been Scammed?
Post by: danboid on July 04, 2006, 01:54:54 pm

Today I got a 4GB CF that was advertised as being 150x speed, which means I should be able to transfer data to it at up to about 22MB/s. I have an internal, USB2 multicard reader for my PC and when copying a large file onto it under KDE I wasn't getting more than 4MB/s

Could it be that my card reader doesn't support the CFII/III transfer modes or is it just that I've been lied to about the speed of the card?

Title: Have I Been Scammed?
Post by: Snappy on July 04, 2006, 08:16:22 pm

The 150x speed is usually the read speed. The 150x speed is also usually the test read speed obtained from a large block of file whose size is the optimal for read transfer for this CF.

eg, If you are reading 1024 x 1KB size files vs read 1 x 1MB file, the 1MB file will be read or written much faster.

Further, write speed is usually lower and the card reader do play a part.

Title: Have I Been Scammed?
Post by: iamasmith on July 05, 2006, 06:20:49 am

Also be aware when you move it to the Zaurus that the bus is a bottleneck on the Zaurus since it is also used for memory too.

Take at this posting for some comparative figures between Microdrive and SanDisk Extreme III https://www.oesf.org/forums/index.php?showtopic=19602 (https://www.oesf.org/forums/index.php?showtopic=19602), note that further on into the post it shows the significant ramp up in performance associated with some overclocking.

-Andy