So ich hab mal bei XDA gesucht und kann deine Aussage nicht bestätigen.
Cluster-Size scheint abhängig von der verwendeten Formatierung zu sein.
Trotzdem gilt anscheinend:
kleines Cluster: kleine Datein schneller, große auffällig langsamergrößeres Cluster: große Dateien schneller, kleine etwas langsamerClass 6 sollte jedoch vollkommen OK sein.
Was ich allerdings beim suchen in XDA immer wieder gefunden habe:
Zitat
DO NOT waste your time buying a Micro-SD card from eBay. Many of them are counterfeits, and you unfortunately have no way of telling the legit ones from the frauds. The counterfeits are skillfully mislabeled to depict higherClass and GB capacity then they actually are capable of, and will even report the "wrong" GB capacity on your phone or PC. For instance, a 2 GB card will be misrepresented as 32 GB, and even say on your phone and PC that its 32 GB. But when you actually try to move files, it will be okay until the 2 GB is used up, then you will get an error.
If you look around the Accessories subforum, you will find several posts by different folks who have been ripped off this way. Stick to legit vendors. [...]
Quelle: http://forum.xda-developers.com/showpost…953&postcount=6
Naja gut A-Data scheint ja namenhaft zu sein.. aber bei dem Preis hab ich was bedenken die zu kaufen wg plagiat / fake etc..
Klar, class 6 ist prima.... 
Sorry will hier ja auch keine Verwirrung stiften
hier nochmal ein paa Aussagen zum Thema class 10
Fast µSD card (Class 4 or 6 recommended. Lots of issues reported with class 10 on the Desire)
http://forum.xda-developers.com/showthread.php?t=852219
Disclaimer: We've been getting reports that a lot of Class 10 cards are incompatible with the Desire!!
http://forum.xda-developers.com/showthread.php?p=16883625
I want to report a serious problem
My tf is adata 32g class10
---------------app2sd issue------------------------------------------------
Hd2 Reads data very very slow when I install apks.
The installed apks icon is empty when I boot it again.
---------------data2sd issue------------------------------------------------
After I flashing roms and A2SDKillerV11_GB .
I boot it and flash Data2SDInstallerv1.3_GB.
Hd2 Reads data very very slow when I install apks.
http://forum.xda-developers.com/showthread.php?t=852219&page=184
zum Thema Cluster..man soll wenn man Probleme mit der Geschwindigkeit hat mal die Karte neu formatieren 4k cluster btw 32k
und noch:
Originally Posted by KaseDesire
Update on this:
Formatted sd card with the internal format of android under settings => sd card:
Cluster size: 4kb
Speed on small files: 3,5 - 4,0 MB (~1-5 mb file size)
Spped on large files: 4,5 - 5,0 MB (>10 mb file size)
Reformatted sd card again with windows, default cluster size:
Cluster size: 32 kb
Speed on small files: 3,0 - 3,5 MB
Speed on large files: 11 - 14 MB
=> With small cluster size, speed is better on small files, but very little difference, and significantly poorer on large files.
=> I use the 32 kb default cluster size of the sd card now.
PS: My sd card is a class 10 with 32 GB.
32kb cluster size might have faster speeds but files will take up more space compared to 4k cluster size.
Reason being, if u have a 4k file on on the card, it will take up only 4k size. But the same file on 32k cluster will take up 32k.
