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I own a PNY - StorEDGE 128GB and I remember that it was initially recognized as a fixed/permanent disk like a hard disk.

I reformatted it to add encryption but now the disk is shown as a removable device. This keeps tools like SkyDrive from using it as a target.

Can I set the volume type somehow?

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Yes! You can change the volume from a removable device to a fixed disk by flipping the removable bit. Lexar made an application for Windows called 'Lexar BootIt', a well known application for this task.

I found a solution involving DD, but I have not tested it and I'd severely recommend backing up your card before doing anything with DD/Terminal. I created these instructions quickly. If you aren't comfortable with Terminal, use Windows! I am not responsible if your SD card is permenantly damaged in this operation. dd is exceedingly dangerous!

Use diskutil list in a Terminal instance to list all volumes. I found my hard drive under /dev/disk1. Remember to substitute disk1 in the later commands with your own disk name.

Don't forget to unmount the disk:

hdiutil eject disk1

And now the command:

dd if=/dev/zero of=/dev/disk1 bs=1 count=1

Again, back up EVERYTHING before doing anything with dd!

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I will test today and accept if working. Thanks in advance. – OliverS Dec 11 '13 at 8:27
    
dd did not work. Will experiment with the Windows Tool tomorrow. – OliverS Dec 11 '13 at 22:35
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dd works. You need to unmount (not eject) your sdcard partition and point the dd command to the correct volume (most likely /dev/disk1 as mentioned in the answer) – Shamasis Bhattacharya Mar 30 '14 at 19:39
    
So I tested this on a PCIe attached SSD on osx 10.10 - and it doesn't work. :( (and yes, I understand exactly what it's doing, and use dd probably on almost a daily basis...) – keen Dec 8 '15 at 1:15

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