ROM vs PROM
Summary: Difference Between ROM and PROM is that Read-only memory ROM refers to memory chips storing permanent data and instructions. While PROM stands from Programmable Read Only Memory is a type of Read only Memory (ROM). It is a type of memory which can only be modified once not again and again.
Read-only memory (ROM pronounced rahm) refers to memory chips storing permanent data and instructions. The data on most ROM chips cannot be modified — hence, the name readonly. ROM is nonvolatile, which means its contents are not lost when power is removed from the computer. Manufacturers of ROM chips often record data, instructions, or information on the chips when they manufacture the chips. These ROM chips, called firmware, contain permanently written data, instructions, or information.
A CD-ROM, or compact disc read-only memory, is a type of optical disc that users can read but not write (record) or erase — hence, the name read-only. Manufacturers write the contents of standard CD-ROMs. A standard CD-ROM is called a single-session disc because manufacturers write all items on the disc at one time. Software manufacturers often distribute programs using CD-ROMs
A DVD-ROM (digital versatile disc-read-only memory or digital video disc-read-only memory) is a high-capacity optical disc on which users can read but not write or erase. Manufacturers write the contents of DVD-ROMs and distribute them to consumers. DVD-ROMs store movies, music, huge databases, and complex software.
PROM stands from Programmable Read Only Memory is a type of Read only Memory (ROM). It is a type of memory which can only be modified once not again and again. Using PROM a user is allowed to write a short programs using special machine known as PROM Programmer.PROM Programmer supply current to the specific cells in Read Only Memory which can easily blow a fuse in them. The whole process is known as burning PROM. Most of the ROM Chips are designed to be modified so, there are less chances of any type of error. Users can modify it by using EPROM or EEPROM.