Formatting i have a sony alpha 100 dslr and a sandisk extreme III 2.0 GB compact flash and a 256mb and a1.0gb memory stick pro duo and i've been getting unable to format disc. can you help me/

Hi friend first you install yours device then logoff yours system then logon again and click on start--->run --> write command cmd then click on ok,Now write commands step by step
1) cd\ press enter
2) c:/>format drive letter (eg d: f: e: etc) press enter
3) read message carefully and then press y
now yours flash drive formatted

hi, sometimes old photos tend to stay inside due to some defect or settings. instead of deleting photos. format the card once before you start clicking the photos. formatting can be done in PC or in your camera. if this does not solve the problem. please revert back to us. thank you. sweet rascal

Make sure your camera is compatible with a 4GB flash card. Some only take 1 or 2 GB cards. If that isn't the issue, format your card inside the camera with the camera's format utility.

its totally damage your sony gb memory stick pro duo buy a new one...

it means it is containing some virus...try to format it with some other system..but it is a frequent problem...try to delete the files while in the phone and format using the computer...its better to claim warranty if it has....
is this cleared your problem?

in psp get virus plz format ur psp than recover u psp than solve r problam thank u

it is due to viruses,torjans or any malicious codes

Hi! I just had the same problem with my Sony A100, when I tried two different CF cards. I was getting the same error message as reported above: "Unable to use card" then "Format?" then that format fails. Thinking the camera is broken, I checked online camera repair sites and also called Sony directly. Sony's flat rate, and that of PrecisionCamera is $228 to fix CF card failure. Then my daughter said, "the CF card in my room works fine in the camera" - and lo and behold - it does. The CF card that works is brand PQI and is marked Hi-Speed 60 2Gb. The cards that do NOT work are marked SanDisk Ultra II 1.0Gb and SanDisk 128 Mb. So my advice is, before you give up on the camera as broken, try a number of different CF cards first.

The second cause of CF failure is if someone has pushed a CF card in the wrong way. That can bend one or more of the tiny metal contact pins in the CF socket in the camera. Look carefully to see that all the pins are straight up. [I don't know how one can straighten these pins, or if the whole socket would need to be replaced...but at least you can determine the cause of the CF failure.]

Best regards - Michael

try formatting them first

format ur memory by rightclick on ur memory and choose the option format and follow few onscreen instructions,,,, 

Thanking you

M. Sridhar