The best replacement for raid is ahci.

The best alternatives to raid are rated as following:
★★★★★  ahci
★★★★★  sata
★★★★  ssd
★★★  ide
★★  backup
★★  no raid
★★  jbod
★★  non raid
★  nas
★  hardware raid
★  lvm
★  software raid
★  san
★  zfs
★  hot shot
★  raptor
★  storage spaces
  scsi
  mirror
  raid
  combat
  ahci mode
  dungeon
  ata
  drobo
  unraid
  not to raid
  ata mode
  mirroring
  time machine
  incursion
  stripe
  achi
  backups
  serial ata
  single drive
  hardware
  rain
  scsi raid
  sata raid
  ahci for ssd
  hdfs
  sata hard drive
  non-raid
  mirrored
  normal attack

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

Other search terms related to raid and their ratings are:
★★★★★ parity
★★★★ different size drives
★★★★ 2 drives
★★★ ssd
★★★ reinstalling windows
★★ ssd and hdd
★★ lvm
★ different drives
★ sata
★ ssd cache
★ tler
★ hot spare
★ usb drives
★ external usb drives
motherboard
8 drives
reinstalling xp
different sized drives
6 drives
dynamic disk
You have in mind a companion for raid and it is not yet here? Propose!



Google Trends

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