If your system uses a non-standard mass-storage adapter (such as some SerialATA, SCSI, RAID or SAS extension cards), you may need to specify the appropriate drivers:
The list of local drives will be displayed. If you cannot see the system partition, press Load driver and browse for a disk that contains the appropriate drivers. ESR will load the driver specified, and update the list of available partitions. The Driver load status window will let you know whether the driver has been loaded successfully.