Hard disk is a storage device and it doesn't come under ROM or RAM category. You can't relate it with RAM or ROM. RAM memory disappears once you turn off your computer but hard disk memory is permanent. ROM is read only memory and you can't change anything in it.
Hard disk is a re-writable permanent memory. You can write and delete any data from Hard disk. You can randomly access any data from any drive and copy and paste it anywhere else.
Hard disk is a re-writable permanent memory. You can write and delete any data from Hard disk. You can randomly access any data from any drive and copy and paste it anywhere else.