Browse Definitions :
Definition

phase-change memory (PCM)

Phase-change memory (PCM) is a form of computer random-access memory (RAM) that stores data by altering the state of the matter from which the device is fabricated. According to its proponents, PCM technology has the potential to provide inexpensive, high-speed, high-density, high-volume nonvolatile storage on an unprecedented scale.

Because it is much closer in speed to dynamic RAM (DRAM), phase change memory technology is ideal for both non-volatile dual in-line memory modules (NVDIMMs) and non-volatile memory express (NVMe) solid state drives (SSDs). Apart from its speed advantage, phase change memory technology is also much more durable than flash, and any concern about the number of daily writes causing wear-out is not an issue. PCM is sometimes called "perfect RAM" (PRAM) because data can be overwritten without having to erase it first.

 

The structure of PCM material can change rapidly back and forth between amorphous and crystalline on a microscopic scale. In the amorphous or disordered phase, the material has high electrical resistance; in the crystalline or ordered phase, its resistance is reduced. This allows electrical currents to be switched on and off, representing digital high and low states. Because the physical structure is three-dimensional, the number of transistors that can exist in a chip of fixed size can be maximized, making it possible for PCM to function many times faster than conventional flash memory, while using less power.

This was last updated in May 2017

Continue Reading About phase-change memory (PCM)

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

SearchSecurity

  • GPS jamming

    GPS jamming is the process of using a frequency transmitting device to block or interfere with radio communications.

  • time-based one-time password (TOTP)

    A time-based one-time password (TOTP) is a temporary code, generated by an algorithm, for use in authenticating access to ...

  • Security Operations Center (SOC)

    A security operations center (SOC) is a command center facility for a team of IT professionals with expertise in information ...

SearchHealthIT

SearchDisasterRecovery

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

  • business continuity software

    Business continuity software is an application or suite designed to make business continuity planning/business continuity ...

SearchStorage

  • SSD (solid-state drive)

    An SSD (solid-state drive) is a type of nonvolatile storage media that stores persistent data on solid-state flash memory.

  • NAND flash memory

    NAND flash memory is a type of nonvolatile storage technology that does not require power to retain data.

  • storage class memory (SCM)

    Storage class memory (SCM) is a type of NAND flash that includes a power source to ensure that data won't be lost due to a system...

Close