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- Newsgroups: comp.os.msdos.misc
- Path: sparky!uunet!microsoft!hexnut!jenk
- From: jenk@microsoft.com (Jen Kilmer)
- Subject: Re: Help: Dos 5.0 Mirror command
- Message-ID: <1992Nov18.075754.25899@microsoft.com>
- Date: 18 Nov 92 07:57:54 GMT
- Organization: Microsoft Corporation
- References: <peter.5@aci_1.aci.ns.ca>
- Lines: 55
-
- In article <peter.5@aci_1.aci.ns.ca> peter@aci_1.aci.ns.ca (Peter Cormier) writes:
- >I have read that the new MIRROR command will save disk recovery data to be
- >used by the UNFORMAT command. My source indicates that a copy of the FAT
- >and root directory is saved in a file called MIRRORSAV.FIL, and that this
- >file is saved on the disk located in the drive specified by the MIRROR
- >command. My question is this. After a format command has been issued where
- >is the file MIRRORSAV.FIL located?
-
- It's located wherever it used to be located :-) In addition, unless you
- format with the /U[nconditional] option, format will do the equivelent
- of a MIRROR. Format will only place this information in the last 1/4 of
- the disk...makes it easier for unformat to find it if necessary.
-
- If you formatted with /u or another version of MS-DOS, unformat will
- search the disk for any mirror files (these are identified by their
- data format). Norton's and CPS' unformat programs perform in not
- dissimilar manner. All else fails (no mirror, nada) unformat will
- TRY to reconstruct the disk using your subdirectory information.
-
- >Am I wrong in believing that DOS uses
- >this file to restore the diskette to its condition as of the time the MIRROR
- >command was issued ?
-
- Well...no, but as I said, unformat can also use information saved
- by format...usually the info saved by format is more up-to-date.
-
- >It appears that Microsoft has once again produced a good piece of
- >software supported by poor documentation.
-
- Hmmm. I learned MS-DOS from the 4.0 manual, which was very like
- the 3.3 manual, which was very like the 3.2 manual. The 5.0 manual
- is an almost total rewrite. It is MUCH better, but it's definitely
- not perfect.
-
- The secrets to handling the MS-DOS 5 manual are:
-
- Roughly the first half of the book is topical - files, disks, etc.
-
- The second half is an alphabetical reference of commands (append
- through xcopy) followed by an alphabetical reference of device
- drivers (ansi to smartdrv).
-
- Most readers of this group likely will find the second half
- more useful. But if you've got a 386, don't skip chapter 12.
- Oh yeah...the index is accurate.
-
- >***************************************
- >* Peter Cormier *
- >* PETER@ACI_1.ACI.NS.CA *
- >* Atlantic Computer Institute *
- >* Halifax, Nova Scotia, Canada *
- >***************************************
-
- -jen
-
-