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Missing Operating System

Posted on 1998-06-08
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Last Modified: 2010-04-26
when starting up the computer, i get the error
"Missing Operating System"
(see question "boot up" on 6/7/98 for more info)


According to documentation on the net, this error occurs
when the boot record signature of the master boot
record does not match a certain value at a certain location.
In this case, the boot sector is invalid and the computer cannot boot.
This error can also occur if there is no active partition defined
in the partition table.


so i start the computer using a bootable MS-DOS disk that contains
Fdisk.exe, Format.com, Sys.com, and Scandisk.exe

i use Fdisk.exe to view the partitions on the hard disk.
i select option 4 (Display partition information).

one partition is listed, and it is defined as active
(uppercase A in the Status column.)

then i run the SYS command

i receive the error:

Invalid media type reading drive C
Abort, Retry, Fail?


then i run:

scandisk c:

and get the error:

Scandisk cannot examine drive c:

what next?
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Question by:jdaues
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2 Comments
 

Accepted Solution

by:
laercio earned 200 total points
ID: 1135992
It's all OK with FDISK use. You have examined the partition, and it is active (Status A). The next step is not to use SYS. After FDISK, you have to do logical formatting using FDISK. If this is not done, you will receive an "Invalid Media Type" message. SYS and SCANDISK can not be use at this moment because without media type (some of information stored by FORMAT), the read/write routines cannot work. Boot up with your diskette and use the command:

FORMAT C: /S

Note all the data is lost afte this. You will have to restore data from a previous backup.

After FORMAT, the hard disk will be OK, and you can execute a boot via HD. The next step is operating system installation.
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Author Comment

by:jdaues
ID: 1135993
did the FORMAT C:/s
all is well
thanks

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