The best replacement for ahci is ide.

The best alternatives to ahci are rated as following:
★★★★★  ide
★★★★★  raid
★★★★★  ata
★★  compatibility
★★  sata
★★  ide mode
★★  raid mode
★  ide ssd
★  irrt
★  uefi
★  native ide
★  raid ssd
★  ide windows 7
★  compatibility mode
★  intel smart response
★  ata ssd
★  ata windows 7
★  ide performance
  nvme
  ide sata
  ide windows 8
  raid windows 7
  legacy
  ide speed
  sata mode in bios
  raid ata
  scu
  sata mode
  ata mode

Your alternative for ahci is not listed? Suggest!
Speaking about ahci, one probably shouldn't forget about ssd.

Other search terms related to ahci and their ratings are:
★★★★★ ssd
★★★ sata
★ reinstalling windows xp
★ esata
You have in mind a companion for ahci and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ahci in all years. Click on graph for more.
ahci
ide
raid