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- 29 Dec 92 23:15:07 -0500 action Relayed
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- Message-ID: <921229220823493-MTASATURN*Elias.T.Moning@EDUC.umass.edu>
- Newsgroups: comp.infosystems.gis
- Date: Tue, 29 Dec 1992 23:15:07 -0500
- Sender: Geographic Information Systems Discussion List <GIS-L@UBVM.BITNET>
- From: Elias.T.Moning@EDUC.UMASS.EDU
- Subject: Reply to DOS operation and data format
- In-Reply-To: <01GST6BDH8K291VZHY@tethys.ucc.umass.edu>
- Lines: 75
-
- > Dear netter;
- >
- > I have the following two questions not specifically related with
- > GIS.
- >
- > (1) Disks formatted on different machines with different
- > DOS versions can not be used interchangeably. Does anybody know
- > why and the solution for the problem? According the MS-DOS 5
- > reference book, "to use a diskette with all versions of MS-DOS,
- > use /B and /1 switches which format the diskette for any MS-DOS
- > version and format only one side." I tried it, it does not work.
- > After I formatted a disk on an IBM ps/2 machine with DOS 4.00,
- > I tried to use it on a DEC 325c machine with DOS 5.00, I got the
- > following error message: "General failure reading drive a". Then
- > I was trying to reformt the disk on the DEC machine, the machine
- > does not allow me to do so, and keeps giving me the meaasage:
- > "Invalid media or Track 0 bad - disk unusable. Format
- > terminated." This may be a silly question, but I do need an answer.
- >
- > (2) Can anybody recommand me some books regarding data formats,
- > particularly the ones we use frequently in GIS?
- >
- > Thanks in anticipation.
- >
- >** END OF MESSAGE **
-
- Regarding problem number 1,
- in formating a diskette you should be aware of it sizes, its capacity
- and your floppy drives. If you are formating a diskette, check first
- what is its capacity: High Density (HD) or Double Density (DD);
- and then check your floppy drive, if you have a newer computer the
- chance is that your drives will read and write for both formats ie.
- HD and DD. Here the problem lies: These drives were set defaults on
- HD no matter the drive size are (5 1/4 inches or 3 1/2), so if you try
- to format a DD diskette in a HD floppy drive, there could be two thing
- happened first, your DD diskette will be formated HD with the risk
- that data saved in that diskette won't be readable by other computer
- drives (I suspect that this might happen to you Shi), second, the
- drive try to identify the existing format for the diskette and when
- it found the formatting command and the diskette capacity does not
- match it rejected it and give the bad media message. Diskette
- unformatable.
-
- Solution:
- if you have a DD 3 1/2 diskette to be formated in a HD 3 1/2 Floppy
- make sure you have the following command at the DOS prompt:
-
- C:\DOS >format a: (or b:) /n:9 /t:80
-
- this will tell the computer to format your disk
- at 80 track. This the format fit for a 720 K 3 1/2 DD diskette.
-
- if you are using MS-DOS 5.0 the command can be done as follows:
-
- C:\DOS >format b: (or a:) /f:720
-
- But if you are formatting a DD 5 1/4 diskette (360 K) the command
- should be as follows:
-
- C:\DOS >format a: (or b:) /4
-
- or if you using MS-DOS 5.0 you can do the following:
-
- C:\DOS >format a: (or b:) /f:360
-
- the previous command will work in any DOS version.
-
- So, please try and let me know if you still have the problem.
-
- Regarding problem No. 2, I got solution to it, maybe someone
- else can help you.
-
-
- Regards,
- Elias Moning.
-