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  2. Device configuration overlay - Wikipedia

    en.wikipedia.org/wiki/Device_configuration_overlay

    Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO.

  3. Hard disk drive failure - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_failure

    A hard disk drive failure occurs when a hard disk drive malfunctions and the stored information cannot be accessed with a properly configured computer. A hard disk failure may occur in the course of normal operation, or due to an external factor such as exposure to fire or water or high magnetic fields , or suffering a sharp impact or ...

  4. Host protected area - Wikipedia

    en.wikipedia.org/wiki/Host_protected_area

    Some vendor-specific external drive enclosures (e.g. Maxtor, owned by Seagate since 2006) are known to use HPA to limit the capacity of unknown replacement hard drives installed into the enclosure. When this occurs, the drive may appear to be limited in size (e.g. 128 GB), which can look like a BIOS or dynamic drive overlay (DDO) problem.

  5. Error recovery control - Wikipedia

    en.wikipedia.org/wiki/Error_recovery_control

    Modern hard drives feature an ability to recover from some read/write errors by internally remapping sectors and performing other forms of self-test and recovery. The process for this can sometimes take several seconds or (under heavy usage) minutes, during which time the drive is unresponsive.

  6. Disk enclosure - Wikipedia

    en.wikipedia.org/wiki/Disk_enclosure

    An external hard drive enclosure that uses a 2.5-in drive and a USB connection for power and transfer Key benefits to using external disk enclosures include: Adding additional storage space and media types to small form factor and laptop computers, as well as sealed embedded systems such as digital video recorders [ 1 ] and video game consoles .

  7. Channel I/O - Wikipedia

    en.wikipedia.org/wiki/Channel_I/O

    The DASD (direct access storage device) initialization program, IBCDASDI, or the DASD initialization application, ICKDSF, places a wait state PSW and a dummy CCW string in the 24 bytes, should the device be designated for data only, not for IPL, after which these programs format the VTOC and perform other hard drive initialization functions.

  8. Bad sector - Wikipedia

    en.wikipedia.org/wiki/Bad_sector

    Hard disk reader. A bad sector in computing is a disk sector on a disk storage unit that is unreadable. Upon taking damage, all information stored on that sector is lost. When a bad sector is found and marked, the operating system like Windows or Linux will skip it in the future.

  9. Hard disk drive interface - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_interface

    Historical Word serial interfaces connect a hard disk drive to a bus adapter [b] with one cable for combined data/control. (As for all early interfaces above, each drive also has an additional power cable, usually direct to the power supply unit.) The earliest versions of these interfaces typically had an 8 bit parallel data transfer to/from ...

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