Hi Greg,

I checked the OSX error log which showed an error reported by fsck_msdos
before trying to mount the .img file. Running this in a terminal window
gives the following error:

Macintosh:~ steve$ fsck_msdos
/Users/steve/Desktop/piCorePlayer1.21_RPI2.img 
** /Users/steve/Desktop/piCorePlayer1.21_RPI2.img
Invalid BS_jmpBoot in boot block: fab800

After searching online for this error, I came across the testdisk
utility.

This reports:

TestDisk 7.0, Data Recovery Utility, April 2015
Christophe GRENIER <[email protected]>
http://www.cgsecurity.org

Disk /Users/steve/Desktop/piCorePlayer1.21_RPI2.img - 68 MB / 65 MiB -
CHS 9 255
Current partition structure:
Partition                  Start        End    Size in sectors

Warning: number of heads/cylinder mismatches 4 (FAT) != 255 (HD)
Warning: number of sectors per track mismatches 16 (FAT) != 63 (HD)
1 P FAT32 LBA                0  32 33     2 172 42      40960 [piCore]

Warning: Bad starting cylinder (CHS and LBA don't match)
2 P Linux                    2 172 43     8  38 30      87936

Warning: Bad starting cylinder (CHS and LBA don't match)
No partition is bootable

I've got no idea what this means but I hope it is helpful. I've tried
three different cards from 4GB, 8GB and 32GB and got the same error on
each.

I'm using Apple-Pi Baker to copy the img file onto a Micro-SD card.

Regards, Steve.


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