SD Cards under OSX aren't supported

[jonpryor]

I'm unable to install onto an SD Card:

$ ./image-usb-stick ../GNOME_3.x86_64-0.0.3-Build1.1.iso 
Loading disks...
No devices found.

The problem is that the OsxDisk.is_valid() check is too stringent and rejects the SD Card.

Disk Utility information for the SD Card:

$ diskutil info /dev/disk3
   Device Identifier:        disk3
   Device Node:              /dev/disk3
   Part Of Whole:            disk3
   Device / Media Name:      APPLE SD Card Reader Media

   Volume Name:              
   Escaped with Unicode:     

   Mounted:                  No

   File System:              None

   Partition Type:           None
   Bootable:                 Not bootable
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported

   Total Size:               4.1 GB (4075290624 Bytes) (exactly 7959552 512-Byte-Blocks)
   Volume Free Space:        Not Applicable

   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no filesystem)
   Ejectable:                Yes

   Whole:                    Yes
   Internal:                 Yes
   OS 9 Drivers:             No
   Low Level Format:         Not Supported

Patch to fix:

$ diff -u image-usb-stick.bk image-usb-stick
--- image-usb-stick.bk  2011-02-07 16:49:57.000000000 -0500
+++ image-usb-stick 2011-02-07 16:55:07.000000000 -0500
@@ -150,7 +150,7 @@
            self.attrs['read_only_media'] == 'No' and \
            self.attrs['ejectable'] == 'Yes' and \
            self.attrs['whole'] == 'Yes' and \
-           self.attrs['internal'] == 'No'
+           (self.attrs['internal'] == 'No' or self.attrs['device_media_name'] == 'APPLE SD Card Reader Media')

    def unmount (self):
        import subprocess