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Full Discussion: Copying/Restoring UNIX O/S
Top Forums UNIX for Dummies Questions & Answers Copying/Restoring UNIX O/S Post 302956555 by MadeInGermany on Thursday 1st of October 2015 05:05:39 AM
Old 10-01-2015
A bootable disk contains an OS-specific boot code. It is not a regular file.
Also there is partitioning information on the disk, and this is not a regular file either.
The frame where files are stored in is called a filesystem. Microsoft DOS only understands FAT filesystem, Windows understands FAT and NTFS filesystem. But SCO-Unix certainly uses a different file system. Linux understands many filesystem types, maybe the one from SCO-Unix.
You all-files backup will miss the boot code, the partitioning information, the filesystem.
--
The BIOS on an X86 PC requires the disk to have an MBR, master boot record. This can contain the boot code, or contains code to find another boot code block (that in turn can find another boot code).
My knowledge ends here. Look at Wikipedia. Hope that other guys here know more...
 

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mwrite(1)						      General Commands Manual							 mwrite(1)

NAME
mwrite - mtools utility to perform a low level write (copy) of a UNIX file to DOS SYNOPSIS
mwrite [-mntv] unixfile msdosfile mwrite [-mntv] unixfile [unixfiles...] [msdosdirectory] OPTIONS
Preserves the file modification time. Specifies that a warning is not issued when an existing file is specified as the target file. If this option is not specified, the mwrite command verifies whether or not to overwrite an existing file. Specifies a text file transfer. Line terminators are converted to the appropriate format. Specifies verbose mode. Displays the new file name if the UNIX file name requires conversion. DESCRIPTION
The mwrite command copies the specified UNIX file to the named DOS file, or copies multiple UNIX files to the named DOS directory. The destination directory cannot be omitted. Reasonable care is taken to create a valid DOS file name. If an invalid name is specified, the mwrite command changes the name, then displays the new name if the -v option is specified. DOS subdirectory names that contain the '/' or '' separator are supported. If you use the '' separator or wildcards, you must enclose file names in quotes to protect them from the shell. The mcd command can be used to establish the device and the current working directory (relative to DOS), otherwise the default is A:. Not all UNIX file names are supported in the DOS world. The mwrite command may have to change UNIX names to fit the DOS file name conven- tions. The following table shows some examples of file name conversions: ----------------------------------------------- UNIX name DOS name Reason for the change ----------------------------------------------- thisisatest THISISAT file name too long file.stuff FILE.STU extension too long prn.txt XRN.TXT PRN is a device name .abc X.ABC null file name hot+cold HOTXCOLD illegal character ----------------------------------------------- EXIT STATUS
The following exit values are returned: Success. Failure. ENVIRONMENT VARIABLES
The following environment variables affect the execution of mwrite: If set, this variable names the file that contains the name of the cur- rent mtools working directory as established by the mcd command. If this variable is not set, the file $HOME/.mcwd is used. FILES
Contains the name of the current mtools working directory as established by the mcd command. If this file does not exist, the default mtools working directory is A:. Executable file SEE ALSO
Commands: dos2unix(1) mcd(1), mcopy(1), mdiskcopy(1), mkmanifest(1), mread(1), mtools(1), unix2dos(1) mwrite(1)
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