Usb not formating due to write protect

The message which you are facing while formatting your flash drive maybe be due to below reasons.
1) It could be due to virus. Try to scan your flash drive with your anti-virus and check.
2) Second reason would be when you connecting your flash drive it may include some autorun files which starts its own when you connect your flash drive and because that file is running it wont allow to be formatted, so try to delete all the files including in your flash drive and than try formatting.
or
There is right protect switch on many pen drives , a physical write protect switch which enables you to either allow writing on the disk or disallow writing on the disk.

All you need to do is toggle the right protect switch and you would be able to write files on your pen drive.
Please find an image below for more information.

https://www.partition-tool.com/resource/manage-partition/format-a-write-protected-usb-flash-drive.html

Format the card in the camera.

Far too often these little things have an almost invisible read/write protect button on them. Look carefully, over the entire surface of the USB Flash Drive. You might have this switch turned to Write Protect, which means there is nothing you can do, until you turn it the other way, and allow the device to be written to.

Cheers!
-a.

Sounds like you will need to format the internal memory of the camera. This will permanently erase all the data from the memory and then you will be able to use it again. To format the memory: Press the Ok button - right arrow to Mode Menu - down arrow to Card tab - right arrow to card setup - right arrow to format option. You will see format yes or no. Choose Yes and press ok. This will clear the write protect message and the memory can be used again.

Sounds like you will need to format the internal memory of the camera. This will permanently erase all the data from the memory and then you will be able to use it again. To format the memory: Press the Ok button - right arrow to Mode Menu - down arrow to Card tab - right arrow to card setup - right arrow to format option. You will see format yes or no. Choose Yes and press ok. This will clear the write protect message and the memory can be used again.

try this tool HP USB Disk Storage Format Tool!!

the drive isnt write protected the usbport or the connection is loose so that the computer is showing the drive as read only drive also you can format it using command and also setting off the read only attribute that may have been put by a virus also softwares like usbcillin makes pen drive writeprotected take care

repair_v2.9.1.1.zip
good program. kdt100-4gb now is ok