Random Access
Average read
Average Write
It appears that my MicroSD card has a maximum write speed of 3.3 MB/s and all devices manage to reach that speed. What’s interesting between the card readers are the large difference between their read speeds. The Dell monitor is at least twice as fast as the X9 card reader and nearly three times faster than the R4 one. Even though the usb card readers have a very slow read speed, in normal use you will only ever write to your MicroSD card. Occasionally you may wish to backup some files such as saves and ROMs, but it won’t be a regular occurrence.
Although the MicroSD card reader provided by the R4 has the slowest read speed, it doesn’t require a MicroSD to SD card adapter. This saves the hassle of having to find an adapter every time you need to transfer files over to the MicroSD card and still works if you lose your adapter.
R4 Battery Life
A simple test was performed on the original DS and a DS lite to measure the battery life impact with the R4 constantly running. Each test simply measured the time for a fully charged DS to turn off with minimum backlight brightness. In order to get constant read requests to the cartridge, I used Jump Superstars for the tests and simply allowed the intro movie to be run continuously. The results from the test were:DS Lite R4 Jump Superstars ROM
13h4m
DS Phat R4 Jump Superstars ROM
N/A (R4 does not support backlight off)In order to get some comparisons between the R4, I ran some additional tests. First I did a control test which just had the DS on in the main menu until the battery ran out. Then I redid the same tests as the R4 on a Ninjapass X9 and an original cartridge to compare the differences between the carts.The results I obtained were:

Hi Richi,

I don’t think you posted this where you wanted to post it.  Where did you want to post it?