[Galaxy S III Mini Themes and Apps] f_ranek:
Hi everybody!

Recently I did some test with Windows 7 64 bit. The tests were performed on fresh system (the phone was plugged for the first time), the phone was plugged directly (no USB Hub down the line), and I've always switched to UMS before plugging the cable.

If you don't want to read such a long post, skip to the emboldened bottom line.

First, I've tested my regular SD card, 2 GBs labeled Kingston. I've copied 1 GB of files from the SD card to the computer, without any trouble and at average speed of 14 MB/s. Then I wanted to delete those files. After selecting them, and hitting Shift-Delete, I got delete progress dialog, which hung up leaving 1 file (out of 6) undeleted. At this point, access to SD card seemed to hung. I was unable to cancel the operation and close the dialog, as well as refreshing of the My Computer window took significant period of time. So I decided to unplug the USB, and replug it again. After that I noticed, that the files I wanted to delete are gone. Then, I copied back 700 MB file to the SD card. The copying avg speed was 3-4 MB/s, and the CPU utilization window (see here: http://xdaforums.com/showthread.php?t=1495763) showed big blue bar.

Second, I replaced the SD card with another 2 GBs, labeled Japan. Then I copied 3 files (40 + 80 + 30 MB - no more space available, and no unnecessary files to delete) to the card. The copying was smooth, with little glitches before or after each file copying. The avg speed was 10-12 MB/s, and the device haven't indicate increase CPU load (neither green nor red or blue bars). Then, I tried deleting several files in a row from a directory, still without any glitches.

Edit: testing now, on Win XP, and through USB hub (does it matter?) does not work so perfectly well :/ I got one hang during folders deletion, and quite a long glitch before copying of several folders started.

Third, unlabeled 2 GB card sold (probably) with Nokia 6303i. First, I wanted to browse file system on the device. The performance was really bad, I was only reading files and traversing directories. Suddenly, all the file names changed to random characters (no writes performed by myself), and the phone indicated file system error, and unmounted the card. When I tried to share it with PC, windows said that the card is not formatted. The same phone, when trying to mount it back. The card can't be read neither on Nokia 6300.

Last, but not least - unlabeled 128 MB card got with my Nokia 6300 back in 2008. The phone indicated unformatted card, or unsupported file system. The same with Windows 7 accessing it with UMS, and Windows XP accessing it from the SD card reader. But, the card can be still read by my Nokia 6300, however, it's name is a little crapped. Moreover, I can access it from Windows XP using that Nokia in UMS mode!

So, the bottom line is

everything seems to depend on the SD card you are using

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Another story: the same micro SD card accessed via UMS in Nokia 6300 - very good performance, accessed via SD card reader with micro SD adapter - terribly bad performance. Another SD card accessed via the same SD card reader - very good performance. So as you can see,

the same SD card, different reading devices - different effect

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The same reading device, different cards - different effect

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