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CHKDSK and UNDELETE in MS-DOS 5.0 have a bug which can corrupt data: If the file allocation table of a disk uses 256 sectors, running CHKDSK /F can cause data loss and running UNDELETE can cause unpredictable results. This normally affects disks with a capacity of approximately a multiple of 128 MB.
Gary Kessler's list of file signatures; Online File Signature Database for Forensic Practitioners, a private compilation free to Law Enforcement; Man page for compress, uncompress, and zcat on SCO Open Server; Public Database of File Signatures [dead link ] Complete list of magic numbers with sample files
This method of file protection was basic. It determined system files by file extension and file path. It was able to restore files from the installation media or a source specified by the user. Windows 98 did not offer real-time system file protection beyond file attributes; therefore, no preventive or reactive measure was available.
It included a more user-friendly interface than CHKDSK, more configuration options, [2] [3] and the ability to detect and (if possible) recover from physical errors on the disk. This replaced and improved upon the limited ability offered by the MS-DOS recover utility. [4] Unlike CHKDSK, ScanDisk would also repair crosslinked files. [5]
This behaviour of chkdsk /r /f does not occur on FAT32 or exFAT volumes. According to MS it is a feature and not a bug because it speeds up the scan a little and they assume that you don't use the system for other things anyway while running chkdsk x: /r /f, but it is known tl cause a lot of problems, so imho it should be mentioned here.
Microsoft Excel uses dedicated file formats that are not part of OOXML, and use the following extensions:.xlsb – Excel binary worksheet (BIFF12).xla – Excel add-in that can contain macros.xlam – Excel macro-enabled add-in.xll – Excel XLL add-in; a form of DLL-based add-in [1].xlw – Excel work space; previously known as "workbook"
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SHARE: File sharing and locking support. SORT: Sorts input. SUBST: Substitutes a drive letter for a subdirectory. SYS: Transfers the system files to another drive to make it bootable. TREE: Display a directory tree. XCOPY: Extended file copy. Standard DOS device drivers: ANSI.SYS: ANSI console driver. EMM386.EXE: Expanded memory manager.