Choose the disk developed especially for your optical drive. HP optical disks are your assurance of disk-to-drive compatibility -- the key to secure protection of your valuable data. Select HP optical disks to enhance the reliability, performance, and longevity of your drive. Each HP optical disk is encased in a sturdy, poly-carbonate casing to inhibit both the attraction of dust particles and static buildup. Select this Rewritable 5.25-inch Optical Disk, 512 bytes per sector, 2.3GB capacity, for Hewlett Packard optical drives.