The Matshita -- also spelt Matsushita and commonly known as Panasonic -- UJ-857 is a series of ultra-thin DVD-RW drives used in Apple laptops as SuperDrives. This particular model appeared in several MacBook and MacBook Pro models made from 2006 to 2008.
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The UJ-857 series use SATA connectivity for a performance boost over the old PATA standard. In addition, these models can read and burn DVD+R and DVD-R discs at 8x speeds. The drive also has a 2-MB buffer. It can write to DVD+RW discs at 8x speed and CD-R discs at 24x speed. The drive can also write to DVD-RAM and DVD-RW discs, but at slower speeds.
The UJ-857 drivers have a 9-mm height compared with the standard 12.7-mm height of other slim DVD drives for laptops. Because of the device's small size, it will not correctly fit in other laptops designed to house larger-sized SuperDrives.
The UJ-857 SuperDrive series has a known firmware upgrade issue. The drive might stop working when upgrading to the SuperDrive firmware version 2.1. Apple has withdrawn the faulty update, but if you encounter this problem, you can bring the laptop in for customer support or try flashing the firmware.
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