Direct Memory Access. UDMA is a protocol developed by Quantum Corporation in conjunction with Intel that supports burst mode data transfer rates. UDMA rated memory cards are rated faster than non-UDMA memory cards. To achieve the full speed of UDMA memory cards, they need to be used with cameras that are compatible with the UDMA standards, otherwise the user will not see the boost in speed that is expected with these fast cards.
Short for Ultra DMA or Ultra Direct Memory Access, protocol for data transfer. Some Compact Flash cards use UDMA.
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