MPORTANT NOTES: 1) Please format your MicroSD cards with the CR-5400 adapter on a SONY product or PSP before use. If you are using two MicroSD cards BOTH cards must be inserted into the adapter and formatted together in your Sony product or PSP at the same time. 2) Once formatted, the cards must remain in the CR-5400 adapter all times to function properly. DO NOT transfer data from the MicroSD cards without the CR-5400 adapter to any other device (PC). In addition, do not switch the MicroSD cards from one slot to the other in the adapter. Once formatted, each MicroSD card MUST remain in the same slot. Failure to follow these instructions will result in data corruption. Once corrupt the cards must be formatted on a PC following the instructions enclosed in the package and then re-formatted on your Sony device as described above. All existing data on the cards will be lost. 3) Most card readers DO NOT support high capacity Memory Stick Pro Duo memory cards. Please use a USB data cable to transfer data from your PSP or SONY device to a PC or other device. 4) For customers using PSP system software version 2.80 or earlier: PSP systems with software version 2.80 or earlier do not correctly recognize high-capacity Memory Stick PRO Duo cards with more than 4GB of free (recordable) memory space. In order to use this adapter you MUST update the system software on your PSP.