Sansa MP3 recognizes 8 gb micro sd card as a 4 gb card

The e250 uses microSD cards, not microSDHC cards. The maximum size of microSD cards is 2GB. Anything larger are microSDHC cards.

Hello,

As far as I can see from the manual the e100 series player only supports up to 2 GB memory SD cards, see page 8 (=7) of the manual:
http://mp3support.sandisk.com/downloads/um/sansa-e100-userguide.pdf

Formatting the SD card of 2 GB should be in FAT format, see:
http://kb.sandisk.com/app/answers/detail/a_id/312/related/1/kw/sd/p/555%2C662%2C697%2C699/r_id/101834

I will have to double-check the documentation that came with that specific MP3 player, but I know that some Sansas will only support upto 2 GB in the expansion slot.

Sansa C240 can only read SD cards that are NOT SDHC - that means it can only read up to a 2gb Micros SD card.

Make sure your usb mode is msc plugin your sansa and go to my computer click on Sansa folder and you should see your removable disk this is your expansion card

Sorry, it doesn't work that way. You can use a separate card reader to put files onto the microSD card. When the card is installed into the Sansa, the Sansa will see the additional music.

There are 3 ways to solve your problem, but all of them are rather kludgy. This is an old player and the integration of the microSD card is not done very well. I believe with the newer players these sorts of issues are not problems. Anyway, here are your 3 possibilities:
1) You can load your music directly onto the card before you put it into the player. Most cards come with an adapter that lets them fit into slots that are for regular SD cards. So if your computer has a slot for an SD card (or if not, you can plug the card into a card reader and then plug the card reader into the USB port on your computer) then you can copy and paste mp3 files onto the card. This is a drag because you can't use Windows Media Player to do this, but instead need to open the folder where the MP3 files are and then copy and paste them onto the card. But it works
2) This is slightly easier. Before you connect the Sansa player to the computer go to the settings part of the main menu and then select mode. You should see two choices. One is MTP and this is the setting you want if you are using the player with Rhapsody service. The other setting is MSC and this lets your computer recognize the Sansa player AND the microSD card. Once you have selected the MSC mode, then you can connect the player to your computer. When you look at the drives on your computer, you'll see 2 new drives. One is the Sansa 280 and the other is the microSD card. Once you see those, you can copy and past MP3 files right onto the card (and/or onto the Sansa). Again, you have to go the folder where your MP3 files live and cannot use WMP to do this
3) I haven't tried this, but others say that a free program called rockbox (www.rockbox.org) let's all this work much better. It sounds complicated, as it puts kind of a new operating system on your Sansa and it may not be reversible, so proceed with caution, but some people love it.
Hope that helps

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.

it might not be possible. sorry.

It should work if it was made by Sandisk and if it is a Micro SD memory card.