Hi, Try this from the SD Card Association . SD Card Formatter. Gratis. https://www.sdcard.org/downloads/formatter_4/ There's two versions, one runs on Windows the other on a Mac. I'm on Mac OS 10.10.5 - seems fine. The SD card is always be formatted for Windows use. The program can also do a 'low level or write zero's' erase. It fixed a troublesome 256 GB SD Card I have - the Apple Disc Utility didn't format it with the correct block size. Made it unreadable via Bootcamp partition. Regards Rory Sent from my iPhone Sent from my iPhone
On 19 Oct 2015, at 03:21, Mark Stegman <mark.stegman@gmail.com> wrote:
Ben,
Update... I thought I would try what you said I had done (and didn't do) and used the MBR option for the partition map scheme. It worked! Sort of.
The PC did not recognise the flash drive and required me to reformat it, which I did, only this time it recognised its full capacity (8gb) so I was able to reformat the drive as FAT32 and have workable device. This was leading me to the conclusion that the menus for the partition map scheme in the Mac Disk Utility are now simply wrong.
I plugged the flash drive back into the Mac. It seemed to be working fine. I copied files OK. Then I tried reformatting it again using the Disk Utility. Now the partition map scheme options for MS-DOS (FAT), ExFAT or any other scheme have disappeared! If I return to the other flash drive formatted using GUID the options appear again.
I feel like I am wasting my time... and yours, but this is a pain when other people still require files to be delivered or backed up on Windows compatible flash drives. It seems my crusty old PC is still good for something. At least I have one way of creating a usable, windows compatible flash drive... use a PC.
Thanks.
Mark
On 19 October 2015 at 10:09, Mark Stegman <mark.stegman@gmail.com> wrote:
Ben,
Sorry but that its NOT what I did. I used the default GUID Partition Map.
Mark
On 19 October 2015 at 10:00, Ben Goren <ben@trumpetpower.com> wrote:
On Oct 18, 2015, at 3:30 PM, Mark Stegman <mark.stegman@gmail.com> wrote:
In ALL cases the PC told me that the drive was unreadable and that I needed to format it, which I did. However, it would only allocate 200mb of space.
You partitioned the disk with an MBR partition map rather than GPT. You'd only ever want MBR for ancient legacy stuff.
b&
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