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In a particular implementation, a special board is added to a computer, which controls the allocation of banks to memory space. The control board has its own memory chip. A computer can write data into this chip, but only the control board itself can read the chip, [note 1] hence it is dubbed "write only" memory. [7]: 200–202
Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified after the manufacture of the memory device. Read-only memory is useful for storing software that is rarely changed during the life of the system, also known as firmware.
In the history of optical storage media there have been and there are different optical disc formats with different data writing/reading speeds.. Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), [1] the same speed of compact disc players without buffering.
A CD-ROM (/ ˌ s iː d iː ˈ r ɒ m /, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data computers can read, but not write or erase.
0=Write Gate Output 26 TRK0# Track 0 Fault/Track 0 in uPD765 controller Input 28 WPT# Write Protect 0=Write Protect Input 30 RDATA Read Data Input 32 HDSEL#/SIDE Head Select / Side select Two uses, see application or use for details. [clarification needed] (Side select:1=Side 0/0=Side 1) Output 34 DSKCHG# Disk Change 1=Disk Change/0=Ready Input 3
A portable Tableau write-blocker attached to a hard drive Example of a portable disk imaging device A Tableau forensic write blocker A Tableau forensic disk imager A forensic disk controller or hardware write-block device is a specialized type of computer hard disk controller made for the purpose of gaining read-only access to computer hard ...
Write once storage Write once read many (WORM) allows the information to be written only once at some point after manufacture. Examples include semiconductor programmable read-only memory and CD-R. Read only storage Retains the information stored at the time of manufacture. Examples include mask ROM ICs and CD-ROM.
When the page that was selected for replacement and paged out is referenced again it has to be paged in (read in from disk), and this involves waiting for I/O completion. This determines the quality of the page replacement algorithm: the less time waiting for page-ins, the better the algorithm. A page replacement algorithm looks at the limited ...