humpty
Group: Members
Posts: 655
Joined: Sep. 2005 |
 |
Posted: Dec. 23 2005,15:01 |
 |
Gee I went out an bought the fastest pendrive I could lay me hands on, but it doesn't feel the DSL drivers can push it to it's limits. And so I google a couple of articles, this is just one of them: http://www.everythingusb.com/usb2/faq.htm
Basically it seems USB 1.1 runs at either 1.5mbit/s or 12mbit/s and USB 2.0 can be low-speed, full-speed (12mbits/s) or HiSpeed (480mbit/s).
Currently I run a PQI USB pendrive spec'd at 25/17mbyte/s (read/write) which can top 22/15 mbytes/s in windoze but in DSL it varies. I kept getting different timings so I used a shell to check on the size, instead of emelfm (which just falls asleep).
It appears for writing, there's a 128Mbyte cache which fills in 15secs, but actual writing (when all the lights go out and emelfm is released) is slow: 750kbytes/s (6mbits/s). read is about the same speed (but doesn't seem to use the cache). And it doesn't seem to care what brand or speed the pen/flash drive is, as I used a Sandisk+card-reader combo to compare (supposed to be a lot slower) but get the same results.
So here I am scratching my head why there's such a big difference compared with windoze (750kbytes vs 15mbytes /sec) - this is not good. It means I can no longer boast to my friends about DSL anymore. I can only guess the linux drivers do not fully support "hispeed' USB2.0?
So I'm asking how fast is your pendrive? and I do pray it's lot faster than mine.
|
.
DSL Market ,
Great VPS hosting provided by Tektonic
