
Notice that that the tool needs administrator rights. Download Virtual Machine USB Boot, start the tool and click Add.You have to follow the procedure below instead.

The I/O cache encountered an error while updating data in medium “ahci-0-0” (rc=VERR_ACCESS_DENIED).įreeing disk space as the dialog box suggests, won’t solve your problem. If your operating system requires write access, VirtualBox will throw this error message: Select Use an existing virtual hard drive file and choose the VDMK file (C:\usb.vdmk in the example) you created in step 2.

Replace # with the disk number you noted in step 2. "%programfiles%\Oracle\VirtualBox\VBoxManage" internalcommands createrawvmdk -filename C:\usb.vmdk -rawdisk \\.\PhysicalDrive#

For the sake of completeness, I describe both methods here.
