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=== PIO Mode 5 ===
A PIO Mode 5 was proposed<ref name="ATA Timing Extension For ATA-3">''Proposed 22 MByte/Sec ATA Timing Extension For ATA-3, January 1995, [ftp://ftp.t10.org/t10/document.95/95-122r0.pdf ATA-3 Extension Proposal]{{dead link|date=April 2018 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> with operation at 22 MB/s, but was never implemented on hard disks because CPUs of the time would have been crippled waiting for the hard disk at the proposed PIO 5 timings, and the [[Direct memory access|DMA]] standard ultimately obviated it. While no [[Hard disk|hard drives]] were ever manufactured to support this mode, some [[motherboard]] manufacturers preemptively provided [[BIOS]] support for it. PIO Mode 5 can be used with CompactFlash cards connected to IDE via CF-to-IDE adapters.
=== Device compatibility ===
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