I added a 8GB micro SD card to my e200 MP3 player but the player won't recognize the card. What do I do?

Your 4GB card is actually a microSDHC card. The e250 works with microSD cards, 2GB and smaller.

The Sansa e200 series machines work with microSD cards. Your 8GB card is actually a microSDHC card. While it fits into the slot, it is electronically incompatible and will not work. You need to use microSD cards, which are 2GB and smaller.

Later model Sansa such as the Fuze will work with microSDHC cards, but not the e200. Sorry if this wasn't the answer you wanted to see, but that's the way it is.

Hello,

Highest capacity memory card for the e200 series depends on the firmware version.

Consulting the Sandisk page gives next information:
Sansa e200 - verify the version of the player. To check, go to Settings > Info.

For 01.xx.xx firmware (e200 version 1) - up to 2GB microSD cards
For 03.xx.xx firmware (e200 version 2) - up to 16GB microSDHC cards
NOTE: Firmware is not interchangeable.

Sandisk sansa e200 series players only allow up to 2GB expansion, BUT with rockbox firmware up to 32GB is available. Only download rockbox firmware if your familiar with transfering and installing files.
Rockbox firmware can be found at http://www.rockbox.org/

your reader does not support the 8gb device, look for firmware upgrade for the reader

try downgrading the sd card make it a 2 gb card

Is you E280 V1 or V2? The V1 will only recognize up to 2GB. You can find this by going to settings, info. If the firmware number starts with 1 it's a V1. V2's start with 3.

If you have a V2 place the card in a card reader to format. Format card to FAT32. If not recognized by a card reader the card may be defective.

If the player is a V1 the micro SDHC can still be used by loading RockBox firmware. But note when running RockBox the sync port will be disabled. To use port the player can still be started in the Sansa firmware but a SDHC card will not be accessible.

http://www.sansaworld.com/
http://www.sansaworldmp3.com/

if the micro sd is HC the sansa will not read it because it does not have the right firmware and connection to read an 8 GIG if you want that get a sansa view

I read somewhere that a 4 GB Micro SD card is the largest you can put in the SanDisk Sansa E260 expansion slot. It's maximum capacity is 8 GB, with internal + external memory put together. This is from what I've read. Hope this helps.

Go to the knowledge base on the Sansa site and find this (chances are you have an SDHC card in an incompatible unit):
Sansa e200 - verify the version of the player.  To check, go to SETTINGS > INFO. 
              
For 01.xx.xx firmware (e200 version 1) - up to 2GB microSD cards 
For 03.xx.xx firmware (e200 version 2) - up to 16GB microSDHC cards 
NOTE: Firmware is not interchangeable. 

Sansa e200R - up to 2GB microSD cards 

Sansa e100 - supports SD cards up to 2GB