The Sony CRX200E is a unique internal optical drive introduced in 2001, notable for being the only commercially released drive supporting the Double Density Compact Disc (DDCD) format. This format aimed to nearly double the storage capacity of standard CDs, offering up to 1.3 GB per disc.
Technical Specifications

• Interface: Ultra DMA/33 (ATAPI)

• Buffer Memory: 8 MB

• Supported Disc Formats:

  • DDCD-R: 12x write speed

  • DDCD-RW: 8x rewrite speed

  • CD-R: 12x write speed

  • CD-RW: 8x rewrite speed

  • CD-ROM: 32x read speed

• Disc Capacity:

  • DDCD: 1.3 GB (1,363,968,000 bytes)

  • Standard CD: 650/700 MB

• Physical Dimensions: 5.25-inch internal drive

• Front Panel Features:

• Single LED indicator

• Eject button

• Headphone jack with volume control

DDCD Format Overview

The DDCD format, defined by the "Purple Book" standard, achieves increased storage by narrowing the track pitch from 1.6 µm to 1.1 µm and shortening the minimum pit length from 0.833 µm to 0.623 µm. This design allows for approximately 1.3 GB of data storage on a standard 12 cm disc. However, DDCDs are not compatible with standard CD-ROM or DVD-ROM drives due to these physical differences. Only drives bearing the "DDCD" logo, like the CRX200E, can read and write these discs.

Features and Limitations

Features:

• Multi-Session Support: Allows for multiple recording sessions on a single disc.

• Packet Writing: Supports both variable and fixed packet writing modes.

• CD-Text and Subchannel Reading: Capable of reading CD-Text and subchannel data.

• DAO-RAW Support: Facilitates advanced disc copying features.

Limitations:

• Audio CD Recording: DDCD-R/RW media cannot be used to create standard Audio CDs.

• Overburning: The drive does not support overburning techniques.

• Compatibility: Cannot read or write 90/99-minute CDs.

• Buffer Underrun Protection: Lacks technologies like Burn-Proof to prevent buffer underrun errors.

• Copy Protection: Does not support backing up certain copy-protected CDs, such as those using SafeDisc 2.

Double Density Compact Disc (2001 – 2004)The Double Density Compact Disc was announced by Sony in 2000, and was launched in 2001 with the CRX200E Double Density Compact Disc recorder.By narrowing the track pitch and shortening the minimum pit length, Sony could increase the capacity of a Compact Disc from 650 MB to 1.3 GB. A new rainbow book specification, the Purple Book, was released in 2000.Both Double Density CD-R (DDCDR) and Double Density CD-RW (DDCDRW) media were available, both 12 cm diameter size as 8 cm media was not produced.By the time of its launch, formats such as DVD-R, DVD-RW and DVD-RAM were available and though they were more expensive, they offered much greater capacity. In addition, Double Density Compact Discs were not readable in existing Compact Disc drives (there was a warning on the back of the case) and were only ever intended for data storage so were not usable in audio Compact Disc drives as they did not meet Red Book specifications.The Sony CRX200E drive was the only Double Density Compact Disc recorder released, and seems to have disappeared from Sony Japan’s website in 2004.The Sega Dreamcast GD-ROM of 1998 was a similar concept, but this used half-speed reading of discs with more closely packed pits to increase capacity to 1.2 GB.
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