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  2. Computer data storage - Wikipedia

    en.wikipedia.org/wiki/Computer_data_storage

    Secondary storage is non-volatile (retaining data when its power is shut off). Modern computer systems typically have two orders of magnitude more secondary storage than primary storage because secondary storage is less expensive. In modern computers, hard disk drives (HDDs) or solid-state drives (SSDs) are usually used as secondary storage.

  3. Solid-state storage - Wikipedia

    en.wikipedia.org/wiki/Solid-state_storage

    An illustration of the write amplification phenomenon in flash-based storage devices. Over time, advancements in central processing unit (CPU) speed has driven innovation in secondary storage technology. [7] One such innovation, flash memory, is a non-volatile storage medium that can be electrically erased and reprogrammed.

  4. Memory hierarchy - Wikipedia

    en.wikipedia.org/wiki/Memory_hierarchy

    There are four major storage levels. [1] Internal – Processor registers and cache. Main – the system RAM and controller cards. On-line mass storageSecondary storage. Off-line bulk storage – Tertiary and Off-line storage. This is a general memory hierarchy structuring. Many other structures are useful.

  5. Computer memory - Wikipedia

    en.wikipedia.org/wiki/Computer_memory

    Historical lowest retail price of computer memory and storage Electromechanical memory used in the IBM 602, an early punch multiplying calculator Detail of the back of a section of ENIAC, showing vacuum tubes Williams tube used as memory in the IAS computer c. 1951 8 GB microSDHC card on top of 8 bytes of magnetic-core memory (1 core is 1 bit.)

  6. Direct-access storage device - Wikipedia

    en.wikipedia.org/wiki/Direct-access_storage_device

    A direct-access storage device (DASD) (pronounced / ˈ d æ z d iː /) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives. [1]

  7. Disk partitioning - Wikipedia

    en.wikipedia.org/wiki/Disk_partitioning

    Disk partitioning or disk slicing [1] is the creation of one or more regions on secondary storage, so that each region can be managed separately. [2] These regions are called partitions. It is typically the first step of preparing a newly installed disk after a partitioning scheme is chosen for the new disk before any file system is created.

  8. Hard disk drive - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive

    Hard disk drives were introduced by IBM in 1956, [5] and were the dominant secondary storage device for general-purpose computers beginning in the early 1960s. HDDs maintained this position into the modern era of servers and personal computers , though personal computing devices produced in large volume, like mobile phones and tablets , rely on ...

  9. Solid-state drive - Wikipedia

    en.wikipedia.org/wiki/Solid-state_drive

    The first devices resembling solid-state drives (SSDs) used semiconductor technology, with an early example being the 1978 StorageTek STC 4305. This device was a plug-compatible replacement for the IBM 2305 hard drive, initially using charge-coupled devices for storage and later switching to dynamic random-access memory (DRAM).

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