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MBP17•David's Avatar
Member Since: Feb 04, 2014
Location: East Midlands, UK
Posts: 426
MBP17•David is a jewel in the roughMBP17•David is a jewel in the roughMBP17•David is a jewel in the rough
Mac Specs: MBP17 2010 8GB 2x960GB SSDs 10.9.4 • MBA11 2010 4GB 128GB 10.9.4 • TC 2TB • TV • iOS bunch

MBP17•David is offline
Unless it is something as simple as the write lock, as chas_m suggested above, I'd try to verify the capacity first: with the same Disk Utility, go to Erase tab, and format the card as Mac OS Extended, or exFAT - this might confirm the actual size, and if everything is okay, then re-format again in exFAT, so you can see it in Windows.

Also an SDFormatter app is a good, standard-compliant one (since they are the ones, who wrote the standard). It works with SD, SDHC and SDXC cards and will correctly identify and report each type, and will format with appropriate file system, i.e. FAT32 for SD & SDHC and exFAT for SDXC.

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