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First off I know this post is about a micro sd, but I'm on a Mac..
Anyway, I got a micro sd card with my phone. It's a Cricket phone that features their Muve Music service. (Though I rooted and removed the app for it) Though the phone came with a 4GB Micro SD card, 3GB of it was dedicated to Muve Music; and the other 1GB was for the user.. Is there a way to use my Mac to access the full 4GB?

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I recommend you insert it directly into a sd card reader attached to your Mac and backup the part of the drive you can access to your Mac's drive. Then open Disk Utility.app select the SD card reader in the left bar on the top level of the hierarchy (not the volume itself on the second level!), switch to the partition tab on the right hand, choose "1 Partition" from the "Partition Layout:" menu and click on "Options" beneath it. Choose "Master Boot Record", confirm the dialog with "OK" and click "Apply". Wait until it's finished, then check if the size of the volume has increased and if it has you can copy your files back.

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Annotated/Labeled Screenshots would make this post amazingly better. –  Jason Salaz Feb 23 '12 at 17:38
    
That doesn't solve anything.. I may have gained a few MB, but I'm still nowhere close to 4GB... –  James Litewski Feb 24 '12 at 2:12
    
@JamesLitewski If you reformat the SD card with a single large partition as indicated in Max's answer, it should give you the full 4GB. If you followed the process correctly, you'll have gained much more than a few MB. What is it about this answer that makes you believe you'll only gain a few MB? –  Adam Davis Apr 4 '12 at 21:36

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