The best replacement for hard disk is hard drive.

The best alternatives to hard disk are rated as following:
★★★★★  hard drive
★★★  floppy disk
★★  ssd
★★  ram
★★  flash memory
★  solid state hard drive
★  flash memory camcorder
★  flash storage
★  solid state drive
★  usb flash drive
★  solid state
★  ssd reliability
★  mini dv
★  optical disk
  rom
  ide hard disk
  pen drive
  cd rom
  internal hard disk
  minidv
  floppy
  flash drive
  cloud storage
  flash memory camcorders
  solid-state drive
  hard disc
  portable hard disk

Your alternative for hard disk is not listed? Suggest!
Speaking about hard disk, one probably shouldn't forget about media player.

Other search terms related to hard disk and their ratings are:
★★★★★ media player
★★★★ os
You have in mind a companion for hard disk and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hard disk in all years. Click on graph for more.
hard disk
hard drive
floppy disk