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Why does Device Manager list my ATA/100 device as using PIO instead of UDMA?

April 26, 2017ATA device list manager PIO UDMA

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Why does Device Manager list my ATA/100 device as using PIO instead of UDMA?

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Windows 2000 does not support ATA/100 (Mode 5) for IDE hard drives until service pack 2 is installed. Without service pack 2 all ATA/100 IDE hard drives that are used with Windows 2000 default to ATA 66 (Mode 4), or PIO mode.