Write once read many

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

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

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

[3][4] There are multiple vendors providing Magnetic Storage technologies including NetApp,[5] EMC Centera,[6] KOM Networks,[7] and others.

Prevention of rewrite is done at the physical disk level and cannot be modified or overridden by the attached computer.

there has been a renewed interest in WORM based on organic components, such as PEDOT:PSS[10][11] or other polymers such as PVK[12] or PCz.