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- From: jjk1@ns1.cc.lehigh.edu (Konsultant Josh/fuzzy.happy.green.box)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: Norton Utility's Calibrate: Is it good or not?
- Message-ID: <1992Aug21.174728.18411@ns1.cc.lehigh.edu>
- Date: 21 Aug 92 17:47:28 GMT
- Organization: Lehigh University
- Lines: 60
-
- In article <1992Aug21.001026.26091@nic.umass.edu>, s9874203@titan.ucc.umass.edu (s9874203) writes:
- >I was told that it was always bad to do low-level format on hard disk.
- >However, Norton Utility's Calibrate does such a thing. My question is: is
- >Calibrate good for hard disk or not (assuming NU suggests me to have some
- >optimization work done on hard disk...)? Or more simply, is low-level
- >format good or not to hard disk? Thanks in advance.
-
- Hard disks need to be formatted in two stages before you can use them:
- first, they need to be "low-level" formatted (this puts down the
- tracks on the disk). Then, they need a "high-level" format; this is
- different for each OS. For example, DOS uses a FAT filesystem, OS/2
- an HPFS, and Linux an inode-type filesystem.
-
- When you low-level format a hard drive, you are essentially recreating
- the tracks from scratch. This is not bad for a hard disk in any way,
- shape or form. It is quite bad for data, as it is generally erased.
- Some programs like NU's Calibrate restore the data after the reformat,
- and are thus fine to use.
-
- Finally, low-level formatting a hard drive is dependent on the
- controller, drive, etc. Calibrate will refuse to re-low level an IDE
- drive because you should *never* low-level format your IDE drive.
- This does not imply it is never done; the manufacturer does it for
- you. The reason has to do not with speed as someone said, but with
- the way that the bad data areas are marked. You will notice that IDE
- drives never have any errors or unusable portions of the drive. This
- is because these are all automagically mapped away by the hard drive
- itself (IDE hard drives have the real controller built-in; the
- controller card is more a dummy than anything else, but usually
- contains your floppy controllers and is thus useful :-).
-
- The upshot of this is that if you force a re-low level on an IDE
- drive, you cannot be sure of exactly what you are reformatting (since
- the drive may actually be playing with a different location than you
- think it is), and you can royally screw things up. If you find that
- your IDE drive is giving you tons of problems and a low-level is the
- only solution you can come up with (after trying everything else),
- contact the drive manufacturer. They may be able to give you a
- program - the one they originally used - which will low-level the
- drive properly.
-
- In answer to your basic question: It is not bad to low-level format a
- drive unless it is an IDE, in which case it should only be your last
- resort after a lengthy discussion with the drive manufacturer. In
- most cases low-level formatting an IDE drive will void the warranty
- unless the manufacturer tells you specifically to do so. Most
- programs (for example, Calibrate and SpinRite II) will recognize IDEs
- and refuse to nuke them. This doesn't mean they're useless - they can
- still perform pattern testing to see if new defective areas have
- developed (in which case you may wish to contact the manufacturer).
-
-
- --
- ____________------------===========------------____________
- from: Josh Kopper
- jjk1@lehigh.edu
-
- Computer Engineering, EECS Department, Lehigh University
-
- Systems Programming - Lehigh University Computing Center
-