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TestDisk can recover deleted files especially if the file was not fragmented and the clusters have not been reused. There are two file recovery mechanisms in the TestDisk package: [2] TestDisk proper uses knowledge of the filesystem structure to perform "undelete". PhotoRec is a "file carver". It does not need any knowledge of the file system ...
For example, in FreeBSD the ATA/CAM stack controls the timeouts, and is set to progressively increase the timeouts as they occur. Thus, if a desktop disk without TLER starts delaying a response to a sector read, FreeBSD will retry the read with successively longer timeouts to prevent prematurely dropping the disk out of the array.
The S-record format was created in the mid-1970s for the Motorola 6800 processor. Software development tools for that and other embedded processors would make executable code and data in the S-record format. PROM programmers would then read the S-record format and "burn" the data into the PROMs or EPROMs used in the embedded system.
Format name Operating system Filename extension Explicit processor declarations Arbitrary sections Metadata [a] Digital signature String table Symbol table 64-bit Fat binaries Can contain icon; ELF: Unix-like, OpenVMS, BeOS from R4 onwards, Haiku, SerenityOS: none Yes by file Yes Yes Extension [1] Yes Yes [2] Yes Extension [3] Extension [4] PE
Fragments of files and directories deemed as corrupt as a result of, for example, power outages while writing, file name overlength, and/or invalid characters in file name, are moved into a directory under the partition's root, named found.000, and renamed into generic hexadecimally numbered files and directories starting with file00000000.chk ...
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USLD – format used by Unison Shift to store level layouts. VIV – Archive format used to compress data for several video games, including Need For Speed: High Stakes. VOL – video game data package; VVVVVV – format used by VVVVVV; CPS – format used by The Powder Toy, Powder Toy save; STM – format used by The Powder Toy, Powder Toy stamp
Medium errors are most commonly detected by checking the read data against a checksum – itself being most commonly also stored on the same device. The mismatch of data to its supposed checksum is assumed to be caused by the data being corrupted .