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TestDisk reads sectors on the storage device to determine if the partition table or filesystem on it requires repair (see next section). TestDisk is able to recognize the following partition table formats: [2] Apple partition map; GUID Partition Table; Humax; PC/Intel Partition Table (master boot record) Sun Solaris slice; Xbox fixed ...
If there is more than one extended partition in a partition table, only the logical drives in the first recognized extended partition type are processed. Some late versions of the DR-DOS IBMBIO.COM provide a preboot config structure, holding bit flags to select (beside others) between various drive letter assignment strategies.
The guessed partition table can also be written to a file or (if you firmly believe the guessed table is entirely correct) directly to a disk device. With some badly damaged devices it is a good idea to use a utility such as ddrescue to make a backup .
The GUID Partition Table (Globally Unique IDentifier) is a part of the Unified Extensible Firmware Interface (UEFI) standard for the layout of the partition table on a physical hard disk. Many operating systems now support this standard.
Partition tables and disk management – fdisk, gdisk, cfdisk [14] smartmontools – a S.M.A.R.T. suite for drive health reporting and data loss prevention; Supports the use of Virtual Private Networks (using OpenVPN, Wireguard, OpenConnect) TestDisk – A tool to check, recover and repair partitions [16]
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.
The GUID Partition Table (GPT) is a standard for the layout of partition tables of a physical computer storage device, such as a hard disk drive or solid-state drive, using universally unique identifiers (UUIDs), which are also known as globally unique identifiers (GUIDs).
The most common data recovery scenarios involve an operating system failure, malfunction of a storage device, logical failure of storage devices, accidental damage or deletion, etc. (typically, on a single-drive, single-partition, single-OS system), in which case the ultimate goal is simply to copy all important files from the damaged media to another new drive.