A file system which is enabled to use a Metadata Partition instead of VAT for write-once discs, is provided by a pseudo-overwrite method. The electrical torch includes a canister, a beam cover connected to one end of the canister and a base connected to another end of the canister. The perimeter of the pliable outer layers are secured together. The at least one control device may be further configured to vary a magnitude of at least one of the upper reference voltage and the lower reference voltage.