http://www.nikonchat.com/nikon-digital-medium-format/

Resolution "card can not be used" error message in 50 f1.4 Nikon D2X Camera
The compact 50 f1.4 Nikon D2X Digital Single-Lens Reflex (DSLR) have an exceptional ability to increase the sensitivity of the sensor and optics provides excellent f/4- f/16. The camera uses Compact Flash (CF) as a storage. Sometimes, CF memory card is with certain problems such as infection, lock the file system read / write error, etc. This leads to the corruption of the CF memory card. In such cases, the data stored on the CF memory card becomes inaccessible. An ideal way to overcome these situations is to restore inaccessible data using a backup copy of valid data. If in case, have not kept the backup or not to restore the data, then a powerful Digital Photo Recovery Software allows you to recover your data completely.
For example – click on some photos of his 50 f1.4 Nikon D2X digital camera. But when you try to view the images, you fail to get the desired outcome and receive the following error message:
"This card can not be used"
When this error message, data stored on CF memory card becomes inaccessible. Additionally, you receive the same error message every time you try to access the images.
Cause:
The major cause of the error message above is corruption on the CF memory card due to the read / write error.
Resolution:
To solve this problem, you must format the CF memory card. However, the format of the memory card erases all data stored in the memory card. In such situations, you have to use a third party application called Digital Photo Recovery Software to recover and restore the lost data. This advanced photo recovery tools, scanning algorithms employing influential to recover your data quickly and accurately. Photo Recovery These applications are equipped with a rich interface GUI that makes it easy to use, in order to allow all used without any prior technical knowledge.
Stellar Information Systems Limited offers the best photo recovery utility, known as Stellar Phoenix Photo Recovery. Support wide range of formats of audio and video files, this application read-only ensures complete and consistent recovery of storage media like the whip SD Cards, MMC cards, Memory Sticks, XD cards, etc. This recovery application is available in two different versions of Microsoft Windows Support (Vista, XP, 2003, 2000 and NT) and Apple Mac OS (Mac OS X 10.5 Leopard, Tiger and 10.4 Panther 10.3.9).
About the Author
Andrew Watson has 6 Years of Experience in the Software Technology researching with Stellar Info. System Ltd which offers data recovery NJ and drive wipe.
Hasselblad H3D Digital SLR Camera System