Missing Operating System .....

[Voldermort]

Hi everyone

I have recentley started to Install Dos 6.22 on a 13.5 gb harddrive. After i have installed DOS and when i reboot the machine i am confronted with the error "Missing operating System".

It doesnt have a virus because i have done a virus scan of the boot disk, can anyone think of any other problems that might occur with this and how to fix it please someone help.

[Vernon Frazee]

The Maximum Partition Size Using FAT16 File System (http://support.microsoft.com/support/kb/articles/q118/3/35.asp) is 2 GB per partition.



[This message has been edited by Vernon Frazee (edited 08-29-2000).]

[Voldermort]

Sorry i should have mentioned that it is partioned in to various 2gb partitions, i think there might be something wrong with the partition table any ideas on how to fix this.

[Eeyore]

make sure the primary DOS partition on the drive is set as Active with FDISK.

If there are two devices on the IDE channel, make sure the drive is set as Master and the other device is set as slave.

Depending on the age of the machine you may have to have the drive on IDE channel 0.
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[Vernon Frazee]

At the end of the ROM BIOS bootstrap routine, the BIOS reads and executes the first physical sector of the first floppy or hard disk drive on the system. This first sector of the hard disk is called the master boot record (or sometimes the partition table or master boot block). At the beginning of this sector of the hard disk is a small program. At the end of this sector is where the partition information, or partition table, is stored. This program uses the partition information to determine which partition is bootable (usually the first primary DOS partition) and attempts to boot from it.

A hard disk's master boot record (MBR) is located in the first sector of the disk (cylinder 0, side 0, sector 1). The partition table is located at offset 01BE, containing up to four 16-byte entries. The fourth byte of each partition table entry is used to mark the partition type.

http://www.gate.net/~bridget/nowonder/images/partition.gif

Source:
Microsoft KB: MS-DOS Partitioning Summary (http://support.microsoft.com/support/kb/articles/q69/9/12.asp)
Microsoft KB: FDISK /MBR Rewrites the Master Boot Record (http://support.microsoft.com/support/kb/articles/Q69/0/13.ASP)

[This message has been edited by Vernon Frazee (edited 08-30-2000).]