The best replacement for udma is pio.

The best alternatives to udma are rated as following:
★★★★★  pio
★★★  dma
★★  udma 7
★  class 10
★  udma 6
★  uhs
  uata
  ultra dma
  eide

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No companions for udma have been suggested so far.
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Google Trends

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udma
pio
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