Remove Secure Drive CDFS Partition from Transcend JetFlash USB Drive
Recently my friend bought a new USB Flash Drive (pendrive) – Transcend JetFlash 8GB JF 620.
This USB Flash Drive was different from other USB Flash Drives.
It had a CDFS partition.You might wondering how a USB Flash Drive can have CDFS partition.
CDFS partition on a USB Flash Drive
When a USB Flash Drive containing a CDFS Partition is plugged into a computer it shows up as two drives.Removable Disk and CD.The CD drive appears as if the computer has another CD ROM drive with a CD inside it.
This CD Drive which appears when the UFD is plugged in, is the CDFS partition.This behaves exactly like a CD ROM.You cannot delete files in the CDFS partition.This partition stays even if you format the USB Flash Drive.Only the Removable Disk partition gets formatted.
How can a USB Drive have a CDFS partition?
A USB Flash Drive contains a microcontroller and flash memory.The microcontroller implements the USB Mass Storage class.In a normal USB Flash Drive, the microcontroller is programmed to implement a Removable Disk.
In a USB Flash Drive with a CDFS partition,the microcontroller is programmed to implement a Removable Disk and a USB CDROM.
Remove or Modify the CDFS partition on Transcend JetFlash 8GB USB Flash Drive
To remove or modify the CDFS partition, the microcontroller inside the usb drive must be reprogrammed.
UPDATE:- Transcend has released a special tool to remove the CDFS partition. Download it here CD-ROM_Remover_v126.96.36.199.rar
Thanks to .iqqmuT for informing us about this special tool.This tool may work for those who are having problems with 32GB Transcend USB Flash Drives.
I had posted about JetFlash Online Recovery to repair your Transcend JetFlash USB Drives.
However, there is a special JetFlash Online Recovery Tool for this USB Drive.This special tool is only for JF620 USB Flash Drives.
I downloaded this tool.The zip file contained two files.
Running OnLineRecovery_620.exe did not help.It did not remove the CDFS partition.However it made security_f.iso as the CDFS partition.This iso file is about 11mb and contains the securedrive.exe and related files.
To make your own CDFS partition you will have to replace security_f.iso with your own iso file.
I have tried not this.I also do not know whether bootable iso images will boot from the CDFS partition.
Since the above tool did not help me in removing the CDFS partition I searched flashboot.ru for some Mass Production Tools.
I found a customized version of JetFlash Online Recovery Tool.
I downloaded this rar file and extracted it to get Alcor_Transcend_JetFlash_OnLineRecovery.exe.
I plugged in my friends’s JetFlash JF620 USB Flash Drive and executed Alcor_Transcend_JetFlash_OnLineRecovery.exe.
I followed the on Screen Instructions.After a few minutes the process was complete.I replugged in the USB Flash Drive and the CDFS partition was gone.
The size of the USB Drive also increased by about 11mb.Earlier this 11mb was occupied by the CDFS partition.