These discs are manufactured by Philips, the brand that many customers can count on for their reliability and compatibility. As opposed to standard (write-once) DVDR, these rewriteable discs allow you to erase and record data on the disc over and over again making them ideal for TV recordings or data backup. The write speed of 1-4x means compatibility with virtually all TV DVD recorders and PC DVD writers which are compatible with the DVD-RW media format.