What is the different between ROM and Hard Disk>?

Question

As far I know the Data stored in these two mediums would not lose when power is removed, is that right?


And ROM stored data in Cells while Hard disk stored data in form of disk, is that what makes them different?


Thanks a lot for your time.

Answer 1

ROM is read only memory that is accessed by the CPU and used for your computer to boot up.

Hard disk aka hard drives are re-writable data holders. Which means that you can write and erase on the drive multiple times.

ROM is on the motherboard already and hard disk are removable items that can interchanged. Where as ROM can not.

Answer 2

ROM:
(Read Only Memory) A memory chip that permanently stores instructions and data. Also known as "mask ROM," its content is created in the last masking stage of the chip manufacturing process, and it cannot be changed. Stand-alone ROM chips and ROM banks in microcontroller chips are used to hold control routines for a myriad of applications. ROMs were also widely used to hold the BIOS in early PCs as well as plug-in cartridges for video games.

Although EPROMs, EEPROMs, and particularly flash memory, are the kinds of non-volatile storage one hears about more often, ROM technology is mature, inexpensive and easy to integrate into any CMOS chip.


Hard Disk:
The primary computer storage medium, which is made of one or more aluminum or glass platters, coated with a ferromagnetic material. Most hard disks are "fixed disks," which have platters that reside permanently in the drive. Removable disks are encased in plug-in cartridges, allowing data to be taken out of the drive for storage or for transfer to another party. Before high-speed connections were common on the Internet, removable SyQuest, Jaz and Zip disks were routinely sent through the post office.

Two Major Categories: ATA/IDE and SCSI
Most hard disks are ATA (originally and still widely known as "IDE"). SCSI drives have traditionally been found on servers and high-performance workstations. The SCSI advantage is that up to 15 devices can be attached to the same controller board, which uses only one slot in the PC. SCSI was the first drive technology to employ fault-tolerant RAID systems. Today, ATA drives are widely used for RAID arrays.

Both ATA/IDE and SCSI hard disks are low-level formatted at the factory, which records the original sector identification on them

Fast Rotation

Hard disks provide fast retrieval because they rotate constantly at high speed, from 5,000 to 15,000 RPM. Either to preserve battery life in laptops or to promote longevity, hard disks can be configured to turn off after a defined period of inactivity.

Answer 3

Rom is your cd drive & a hard disk is a storage device inside your computer. Your hard disk will retain information even when power is shut off.

Answer 4

ROM means Read Only Memory. That's the difference. HDD is RAM (random access memory) eventually

Answer 5

yes, that's right.

also, ROM is the abriviation for Romania, the country :)