I just got a Acer A100 too and discovered the SD card is useless. A 8gb tablet is pretty D&$% useless if you can't use the microSD slot. Taking it back tomorrow. Wish to Hell these company’s would stop advertising feature on their devices that they don't have working.
Most of the applications that I have downloaded have given up on trying to use the external sd card because each company making Android devices has defined its path differently. It seems that the Android OpSys folks never considered that there could be 2 SD Cards on the system.
And yes, Documents to Go seems to have solved the problem.
You find the path to the external SD card, and a file manager that can cut and paste.
Then move the files. ES File manager will work this way. Just make sure of your paths.
Or you find the driver for the tablet, read the tablet via micro SD to computer, then transfer to External SD card.
Do you have the Micro usb to usb cable that came with the device?
If so -
This works on Windows XP.
Plug the tablet into the computer. You should get the whole windows routine about found new hardware. Once your hardware is ready to use, open MY COMPUTER on windows. You should see Acer Iconia twice - one will say camera. You want the other Acer file. Open that file and you will Internal Storage and SD card. You transfer files as normal with drag and drop or cut and paste.
If you store books on the SD card - you will have to open your book reader, (I use FB Reader)
In the library you should see a list.
Favorites, Recent, By Author. You want File Tree.
Open File tree, find Device - Open Device and find mnt- open mnt, and you should see external_sd. Open external_sd, and that's your external card.
Music and video players will find the external card.
I don't know if I'm suopposed to write this here, but I have a similar problem with my A100. It won't read/recognize an external hard disk, nor an usual USB. Is there a programe or a device that could make this work?
For example, I would like to watch movies on my tablet by connecting it to a samsung hard disk directly, so that I don't have to use computer to transfer movies from hard disk to tablet.
If I set the home directory to external_sd does this mean that when I take a picture with the stock camera that it will automatically be placed in the micro SD card storage and not the internal phone memory?
Also by doing so does this interfere with any future apps that I may update or install as new through the Google Play store etc?
I should have perhaps placed this on my latest thread, Mods please could you move this to my latest thread please?