How to remove "write protection" from memory stick

[sialone]

I hav my sony 4gb flash disk, i can open it, but i cant delete files or add files in it. An error wich says THE DISK CANNOT BE WRITTEN TO BEACUSE IT IS WIRTE PROTECTED. physically there is no write protect switch in it. Help plz

[StevenBurnish]

I tried to format my SD card with a low level format tool. It completed the process, but the files are still there! Help anyone??

[SiLeNciFy]

my SANDISK 16GB memory stick Pro duo just suddenly stop working on my PSP i cant remove or add files to it... i tried using a cardreader the results is still the same... when i tried to delete the partition in it , it pops out a window saying write.prodected then that is this "data error : cyclic redundancy check" i need help~

[SiLeNciFy]

it won't let me format it too... tried all sorts of formatting...
-forced format
-windows format
and this program called swissknife...

[psapugkid]

I have 8GB micro in a SD Adapter, tried both Laptop reader and USB reader. Both give errors of Write protection etc. Tried switching protection on Adapter without any difference.

CHKDSK shows no errors or problems with micro card.

Tried H2testw with these results:

Error creating file 'F:\1.h2w'
(The media is write protected. Code 19)
Warning: Only 3378 of 7572 MByte tested.
Writing speed: 0.00 KByte/s
H2testw v1.4


Also tried from 'Herinsbootable CD' using "Killdisk and WriteprotectUSBdevices" without success.

Any suggestions

thanks