The file in my SDHC card (SanDisk 8GB class 6) can be read with my laptop (Pavilion dv2500). However, when I try to save a file, it show me "The disk is writen-protected." After I switch the card's lock tab, my laptop still show the same warning message.
My sony computer can save a file into the same SDHC card when the lock tab at the "Unlock" position.
I would try formatting the card on the Pavilion see if that works
-------------------------------- Pavilion DV2714CA, Vista Home Premium 32bit(Successfully running Windows XP Pro SP2), Intel T2330 1.60 GHz, Intel Graphics Accelerator X3100, 4GB RAM, 160 GB HDD --Do everyone a favor Post back your results, Resolved or Not - LEAVE KUDOS !
The card reader slot is internally a stainless metal housing with a small tab on the side which acts as a switch making contact with another piece of metal depending on the position the card lock piece is in. Most likely your reader's switch is defective and it might be bent back to make contact again but otherwise it's an advanced soldering repair job that requires special unsoldering solder or a hot air gun to repair (meaning otherwise the whole mainboard needs replaced assuming the card reader is built onto the mainboard instead of a daughterboard.