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Line 54: === PIO Mode 5 === A PIO Mode 5 was proposed<ref name="ATA Timing Extension For ATA-3">{{cite web \|url= https://www.t10.org/ftp/t10/document.95/95-122r0.pdf \|title=Proposed 22 MByte/Sec ATA Timing Extension for ATA-3 \|first=Joseph \|last=Chen \|date=January 10, 1995 \|publisher=Technical Committee T10 (X3T10) \|work=T10.org \|archive-url= https://web.archive.org/web/20100620052300/https://www.t10.org/ftp/t10/document.95/95-122r0.pdf \|archive-date=June 1020, 2010 \|url-status=live \|access-date=February 19, 2020}}</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. == See also ==

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