  Optical Disc
 The antistatic cartridge is designed to withstand both heat and shock. Furthermore, the robust cartridge has a revolving shutter mechanism to prevent the entry of dust. As a result both types offer a data integrity rating of more than 50 years.
Furthermore, designated hard case that made of propylene resin can protect media firmly. Not to mention shock resistance, it is designed to see the cartridge label even from outside of the case.
Dual-head compatibility
The shutter has been specially designed to allow for multiple-pickup mechanisms in future iterations, thus enabling a smooth transition to drives offering far higher read/write speeds.
* Internal drives built into in the BW-F101, BW-S101, BW-RS101, BW-U101, BW-RU101, and BW-J601 Series are equipped with a single optical head.
Rewritable and write-once media
Two types of single-sided media are available, rewritable and write-once, both offering 23GB of storage capacity. Rewritable media allows data to be rewritten and overwritten repeatedly. Write-once media cannot be reformatted and does not allow data to be overwritten, making it ideal for long-term archiving; as long as there is space available, data can always be added but never altered or deleted.
Model name PDDRW23B PDDWO23B
Format Rewritable Write-once
Capacity 23.3 GB
Sector Size 2,048 bytes*
Recording Layer Phase change
Track Pitch 0.32 µm
Cover Layer Thickness 0.1 mm
Disc Diameter 120 mm
Cartridge Dimensions 128.6 (W) x 130.6 (H) x 9.1 (D) mm
Erase/Write Cycles > 10,000 times**
Mass 90 g
Estimated Shelf Life > 50 years**
Estimated Archival Life > 50 years**
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