MicroSD wont work in MP3 player

You didn't buy a microSD card, you bought a microSDXC card.

The Eclipse 180 works with microSD cards (2GB or smaller) and microSDHC cards (32GB or smaller). It does not work with microSDXC cards.

The Sansa e250 works with microSD cards. Your 8GB card is actually a microSDHC card (the HC stands for High Capacity). While microSDHC cards fit into the slot, they are electronically incompatible and will not work in the e250.

microSD cards max out at 2GB in size, but you can put your music on several of them and swap them in and out. It's not as convenient as having them all on one card, but that's the best you can do with the e250.

Some later models such as the Fuze will accept microSDHC cards.

try thishttp://kb.sandisk.com/app/answers/detail/a_id/1102/kw/card%20is%20locked

You can't augment the internal memory, short of replacing the entire motherboard. And if you're going to take the innards out of another Sansa, why don't you just use that other Sansa instead?

You can add memory in 2GB chunks by using microSD cards. Photos and videos must be in the 2GB internal memory, but any music you put into a MUSIC folder on the card will appear and play on the Sansa. By putting different albums (or sets of albums) on different cards, you can easily switch between them.

Be sure you use microSD cards, not microSDHC cards.

The Sansa e250 uses microSD cards. Your 4GB memory card is actually a microSDHC card. While it fits into the slot, it is electronically incompatible. You need to use microSD cards, 2GB and smaller.

The Sansa e-series works with microSD cards. While microSDHC cards will fit into the slot, they are electronically incompatible and will not work. You need to use microSD cards, 2GB and smaller.

You can put music on any as many microSD cards as you wish. Each microSD card will hold up to 2GB, as long as you put the files into a folder called "MUSIC." You can't put any photos or videos on the cards, however, only audios. And, of course, you can only have one card in the e250 at any one time, but you can swap them in and out.

Make sure you use microSD cards. The e-series will not use microSDHC cards.

The e250 uses microSD cards. Your 4GB card is actually a microSDHC card and will not work in the e250. You need to limit yourself to microSD cards, which are 2GB at the largest.

You'll also need to put your music into a folder named "MUSIC" on the card. Pictures and videos will have to remain in the main memory.

Hello,

The micro card (the smaller one) can be used alone in a port that accepts (microSD ports)such as those on a Sansa c240, c250, e250 etc.
If you have a regular SD slot (larger than microSD) then you plug the micro card in the adapter and plug the whole into a regular SD slot.

Plug the card in your computer and copy paste the files. Or plug the micro card in an MP3 player that accepts it and use you music transfert software.

You only have one card (the micro SD one), which you can use in two possible slots.

Hope it helps.

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