them will behave as an 800 KB drive. These two models can be upgraded via the M0244 upgrade kit (which replaces the IWM disk controller with the SWIM) and gain full use of the SuperDrive. All later models shipped with the SWIM. The first Macintosh model to include a SuperDrive floppy drive was the Macintosh IIx (1988). Every Macintosh and PowerBook introduced from 1988 to 1997 (with the exception of the PowerBook 100, PowerBook Duo series, and PowerBook 2400c, which offered a proprietary external floppy drive as an option), had a built-in SuperDrive floppy drive. The last model to include one was the beige Power Macintosh G3 series, which was manufactured until January 1999. The PowerBook G3 1998 model (a.k.a. Wallstreet) had an optional floppy drive module. The PowerBook 190 series, PowerBook 5300 Series, PowerBook 3400c, and original PowerBook G3 shared the same interchangeable floppy drive module as a standard feature. The drive as mounted on PowerBooks lacked the auto-inject feature of Apple's initial desktop SuperDrive implementation, requiring the user to manually insert the disk all the way into the drive. The feature was dropped throughout the lineup during 1993–94. The PowerBook 1400 series also had a floppy drive module, but was incompatible with the other PowerBooks. The end of the SuperDrive coincides with the demise of Old World ROM Macs; with the advent of the New World ROM machines, Apple stopped offering internal floppy drives on all models. The SuperDrive is not supported in Mac OS X, not even on the few Old World ROM machines that can officially run OS X. Internal CD and DVD drive Once the use of floppy disks started declining, Apple reused the trademark to refer to the optical drives built into its Macintosh models, which could read and write both DVDs and CDs. The early 2001 release of the Power Mac G4 was the first Macintosh to include a SuperDrive. SuperDrives featured 6–24x write speeds and supported the DVD±R, DVD±RW, CD-R, and CD-RW formats along with all normal read-only media. Some drive models used as SuperDrives are capable of using DVD-RAM but on these drives, the ability to write to these discs is disabled. They can, however, read back DVD-RAM discs. Apple never offered a Blu-ray drive or supported playback of the format. DVD±R DL Dual Layer DVD did not come out until 2005 and was not supported on the SuperDrive until the