On September 12, 2011 at 10:30AM (CST...i.e. GMT-6) I spoke with Acer Customer Support and asked what class (speed) micro-sdhc cards are supported by the Acer A500 tablet. This is what I got from their support (untouched, no changes--- spelling, and all....: Suja S Kumar: Hi, my name is Suja S Kumar. How may I help you? cheryl coman: whqat speed microsdhc cards supported by acer 500? Suja S Kumar: Are you referring to tablet A500? cheryl coman: yes-- wjat else? Suja S Kumar: Cheryl, It supports MicroSD memory card up to 32GB (SDHC 2.0 compatible with support for up to a Class 10 microSDHC card) cheryl coman: so, you're saying that the acer a500 tablet will write 10 mb/s and read at 20 mb/sec (class 10 speeds)? Suja S Kumar: It is SDHC 2.0 compatible. cheryl coman: that's not my question-- are you saying that my acer a500 will write 10 mb/s and read 20 mb/s (class 10 specification)??? Suja S Kumar: Let me check with another department so that I can get a confirmation. cheryl coman: ok Suja S Kumar: May I place you on hold for 2 minutes? cheryl coman: ok Suja S Kumar: Thank you for being online. Suja S Kumar: The concerned team is still researching. cheryl coman: ok Suja S Kumar: May I place you on hold for 2 more minutes? cheryl coman: ok Suja S Kumar: Thank you for being on hold. Suja S Kumar: The SD card slot will support class 10 specifications. cheryl coman: great-- I'll get this out on the web immediately-- thank you, Suja!!! Suja S Kumar: You are most welcome. OK, it's not exactly God talking, but the Acer community can hold Acer accountable if the info is incorrect! Remember this, however-- you're actual speeds depend upon a several variables. Some Class 10 cards are better than others (so what's new? Surely manufacturers don't fudge their data...). Your tablet environment affects speed-- what's going on (multitasking, available RAM, etc.). Size of the files you are transferring affect performance-- small files will normally transfer faster than larger files). The utility (program) you might use to "measure" speeds is only as good as the person who coded it-- I can write a speed utility, and it will "measure", but I can slant it anyway I want. Or, maybe I have incorrect technical details and am not really "measuring" correctly, at all! Caveat emptor. The way you wiped your nose this morning.....well, maybe not this one! Ya' pays yur money, and ya' takes yur chances.... Hope this adds something to consider.