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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.
In particular, "hidden partitions" (those with their type ID changed to an unrecognized value, usually by adding 10h) are not. MS-DOS/PC DOS versions 4.0 and earlier assign letters to all of the floppy drives before considering hard drives, so a system with four floppy drives would call the first hard drive E:.
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.
Formerly, on disks formatted using the master boot record (MBR) partition layout, certain software components used hidden sectors of the disk for data storage purposes. For example, the Logical Disk Manager (LDM), on dynamic disks, stores metadata in a 1 MB area at the end of the disk which is not allocated to any partition.
The type of drive. 0xF8 is used to denote a hard drive (in contrast to the several sizes of floppy). 0x16 2 bytes 0x0000 Unused This field is always 0 0x18 2 bytes 0x003F Sectors Per Track The number of disk sectors in a drive track. 0x1A 2 bytes 0x00FF Number Of Heads The number of heads on the drive. 0x1C 4 bytes 0x0000003F Hidden Sectors
For hard disks with 512‑byte sectors, the MBR partition table entries allow a maximum size of 2 TiB (2³² × 512‑bytes) or 2.20 TB (2.20 × 10¹² bytes). [ 1 ] In the late 1990s, Intel developed a new partition table format as part of what eventually became the Unified Extensible Firmware Interface (UEFI).
In computing, a hidden folder (sometimes hidden directory) or hidden file is a folder or file which filesystem utilities do not display by default when showing a directory listing. They are commonly used for storing user preferences or preserving the state of a utility and are frequently created implicitly by using various utilities.
Not every hidden share is an administrative share; in other words, ordinary hidden shares may be created at user's discretion. [1] Automatically created: Administrative shares are created by Windows, not a network administrator. If deleted, they will be automatically recreated. [2] Administrative shares are not created by Windows XP Home ...