Write once read many

WORMwrite-oncewrite-once-read-manyWORM devicewrite onceWrite Once Read Many Diskwrite once, read multiplewrite-once, read-manywritten once and read arbitrarily many
Write once read many (WORM) describes a data storage device in which information, once written, cannot be modified.wikipedia
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CD-R

CDRrecordable CDCD-Rs
WORM drives preceded the invention of the CD-R and DVD-R.
A CD-R disc is a compact disc that can be written once and read arbitrarily many times.

Read-only memory

ROMRead Only MemoryROMs
Read-only memory (ROM) is also a WORM medium.
CD-R is Write Once Read Many (analogous to PROM), while CD-RW supports erase-rewrite cycles (analogous to EEPROM); both are designed for backwards-compatibility with CD-ROM.

Data storage

data storage devicestoragestorage media
Write once read many (WORM) describes a data storage device in which information, once written, cannot be modified.

Write protection

write-protectwrite protectwrite protected
This write protection affords the assurance that the data cannot be tampered with once it is written to the device.

Data

statistical datascientific datadatum
This write protection affords the assurance that the data cannot be tampered with once it is written to the device.

DVD recordable

DVD-RDVD-RWDVD+R
WORM drives preceded the invention of the CD-R and DVD-R.

Ablation

ablativeablateablated
These drives typically used a 12 in disk in a cartridge, with an ablative optical layer that could be written to only once, and were often used in places like libraries that needed to store large amounts of data.

Punched card

punched cardspunch cardpunch cards
Punched cards and paper tape are obsolete WORM media.

Punched tape

paper tapepunched paper tapepunch tape
Punched cards and paper tape are obsolete WORM media.

Operating system

operating systemsOScomputer operating system
Such memory may contain the instructions to a computer to read the operating system from another storage device such as a hard disk.

Hard disk drive

hard drivehard diskhard drives
Such memory may contain the instructions to a computer to read the operating system from another storage device such as a hard disk.

Computing platform

platformplatformssoftware platform
The non-technical end-user, however, cannot write the ROM even once, but considers it part of the unchangeable computing platform.

Broker-dealer

broker-dealersbroker dealerbroker/dealer
WORM was utilized for Broker-dealer records within the Financial Industry Regulatory Authority and the U.S. Securities and Exchange Commission.

Financial Industry Regulatory Authority

FINRANational Association of Securities DealersNASD
WORM was utilized for Broker-dealer records within the Financial Industry Regulatory Authority and the U.S. Securities and Exchange Commission.

U.S. Securities and Exchange Commission

Securities and Exchange CommissionSECUnited States Securities and Exchange Commission
WORM was utilized for Broker-dealer records within the Financial Industry Regulatory Authority and the U.S. Securities and Exchange Commission.

Computer

computerscomputer systemdigital computer
The CD-R and DVD-R optical disks for computers are common WORM devices.

File system

filesystemfile systemsfilesystems
However, these disks often use a file system based on ISO 9660 that permits additional files, and even revised versions of a file by the same name, to be recorded in a different region of the disk.

ISO 9660

ISO9660ISOCDFS
However, these disks often use a file system based on ISO 9660 that permits additional files, and even revised versions of a file by the same name, to be recorded in a different region of the disk.

Computer file

filefilescomputer files
However, these disks often use a file system based on ISO 9660 that permits additional files, and even revised versions of a file by the same name, to be recorded in a different region of the disk.

SD card

microSDSDmicroSDHC
The SD card and microSD card spec allows for multiple forms of write-protection.

PEDOT:PSS

In recent years there has been a renewed interest in WORM based on organic components, such as PEDOT:PSS or other polymers such as PVK or PCz.

Radio-frequency identification

RFIDradio frequency identificationRFID tag
Organic WORM devices, considered organic memory, could be used as memory elements for low-power RFID tags.

M-DISC

M-DISC (Millennial Disc) is a write-once optical disc technology introduced in 2009 by Millenniata, Inc. and available as DVD and Blu-ray discs.

Holographic data storage

Holographic memoryholographic storageholographically
The write-once, read many (WORM) approach to data storage would ensure content security, preventing the information from being overwritten or modified.