How do I repartition an SDHC card in Windows?

Here's an article with working link archived version without images. And also a summary of how you do this:

Start DiskPart by opening Start menu and typing in diskpart in the search. After giving DiskPart permission to start with administrative privileges, you will be in a console window with DISKPART> prompt.

Deleting partitions

Type LIST DISK to find out what disk you need to change. Note that you are looking for a disk with the same number as in the Disk Management tool, so in OP's case, it's Disk 1.

Next you need to select the disk you wish to work on. Type SELECT DISK 1. Make sure the correct disk is selected by typing LIST DISK again.

Now, you need to select the partition you wish to remove. Type LIST PARTITION to see a list of all partitions. To select the first one, type SELECT PARTITION 1.

To remove the partition, type DELETE PARTITION.

Creating partitions

To create a partition, you can either proceed by using the Disk Management tool, or type CREATE PARTITION PRIMARY. This creates a partition that fills the free space. If you wish to create a partition of specific size, you need to type CREATE PARTITION PRIMARY SIZE=NNN where NNN is the partition size in MB.

You can get more information about the various options by typing HELP CREATE PARTITION and/or HELP CREATE PARTITION PRIMARY.

Exiting DiskPart

Either type EXIT or press Ctrl+C.

Additional notes

While this works for many SD cards (and other media), for SD cards specifcially, it is recommended to use SD formatter from SD Association. It will not remove all partitions, but will ensure that any content security-related parts of the card are left intact.

Although not being asked, this method may not work for USB sticks. I have 'bricked' USB sticks by partitioning them on Linux or writing ISO images to them, and to date, I haven't found a way to fix them.

@bvukelic's answer is correct.. but it's too long :)

If you are in Windows 7 or newer, just open command prompt run DISKPART

• You might just need to delete volume - LIST VOLUME, SELECT VOLUME #, then finally DELETE VOLUME, <- Just be careful and read what you are deleting

Then just proceed to usual "Manage" disk afterwards.

Just read everything in there carefully :)

You can delete it with the DiskPart command line tool on windows. Read this http://www.winability.com/delete-protected-efi-disk-partition/

You can't delete a partition while it contains a filesystem that is currently set to be always mounted. Remove the drive letter (From the Change Drive Letter and Paths option) and then you should be able to delete the partition.

You can also use the

MiniTool Partition Wizard

or the

EaseUS SD Card Partition Software.

The latter as of version 11.9 does not provide support for Ext 2 to 4 file systems.

The SD Formatter mentioned in a previous answer seems to erase all partitions on a SD card!

However, please note that Windows can only recognize the first partition on a removable disk, thus the second partition has no drive letter.