cyborg4 wrote:Important information listed in
bold.
I have
waited four and a half months for my Pi, and then when it turns up I can't use it! I am using Win32 DiskImager and have
just performed a scandisk on my SDHC card ( that I have
plugged in through a USB SDHC adapter )
via the GUI. I now am
unable to write to the card via Win32 DiskImager or dd for Windows, and yet I
can still write files to the SDHC in Windows Explorer. I am using a Sony SDHC C4 4GB with the product number SF-4B4. ( The official Sony support page for this product is at
http://www.sony.co.uk/support/en/product/sf-4b4 ). Can anyone help? I am using a
Windows 7 32bit OS.

Hi CB4 - sorry to even have to suggest this, but is it possible that the sliding 'lock' switch on the card has somehow moved to the 'locked' position since you did your various operations on the card in Windows?
Working in Windows, try reformatting the card: With the card in the reader and the reader in the computer, use a file browser / navigator (such as Windows Explorer) to look at the drives on your system. Right-click on the icon for the drive/reader with the card in it, and select 'Format'. If offered the choice of 'Quick Format', reject that choice / uncheck that box so that Windows will fully reformat the card.
Alternatively, if you have access to a digital camera which can use SDHC cards, put the card in the camera and use the camera's 'format card' feature to format it - it will probably create some unwanted folders (such as 'DCIM') on the card, but don't worry about that - once Win32DiskImager is able to 'see' the card it will overwrite everything on it anyway.
Either way, see if win32 DiskImager is now able to write to the card. Incidentally: Win32DiskImager nearly always comes up with an error message about the media being 'in use' when first run. Just click OK to make that go away, and then carry on.