I was recently unable to format a SDHC card with Windows Explorer or the Disk Management console (diskmgmt.msc). I did apply the same trick as when I was unable to delete a volume of a SDHC card.
The symptom was the same: in the Computer Management > Disk Management console... the "Delete Volume..." menu was dimmed (disabled)...
The solution was to format or delete the volume using command 'Diskpart' in a Dos prompt.
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See here how menu is disabled when I want to delete it:
To solve this, I used the solution published on Internet by Salty Wagyu : diskpart. Here is the list of commands to be used in a dos prompt run as Administrator:
- List Disk
- Select Disk x (where x is the number corresponding to your SD Card)
- Create partition primary
- Format fs=fat32 quick