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WDe and GPT, booting DOS (Users)

posted by Japheth Homepage, Germany (South), 11.12.2022, 10:39

> Think problem solved - Should be on sector 006 (not 000).
That's pretty unlikely. Sector 6 on FAT32 is commonly used to store the "backup" bootsector. How do you come to your conclusion?

> I am using WDe1.00 and on loading DOS71BSG.bin (1536 bytes) for use on the
> GPT disc the number of sectors to load does not make sense to me (see
> below)
 [snip]
> Bytes per Sector: 512 Sectors per Cluster: 0
> Reserved Sectors: 32 FATs: 2
> Maximum Root Entries: 0 Media Descriptor: 248
> Sectors per Fat: 0 Partition Start: 0
> Sectors in Partition: 0 Hard Disk Number: 128 (0)
> Root Start Cluster: 2 FSInfo Sector Number: 1
> Backup B.S. Location: 6 Signature: AA55
>
> Number of Sectors (1-0):
Well, as you can see, the values of many fields in the boot sector are kind of "invalid" - the one that may cause this strance msg is "Sectors in Partition". A partition size of 0 is definitely something that WDe cannot handle properly.


> Would you advise me to completely WIPE the MBR disc and reinstall MSDOS71
> etc - at present I do not have a spare hard drive to replicate the MBR
> disc.
The problem most likely is that you modified sectors 0-2 of partition 1 ( drive C:) of your MBR-partitioned disk. You'll have to boot from USB-stick, and use FDISK to delete/create the partition again - unless you've make a backup copy and stored it somewhere "safe".

> Any ideas on what might be going wrong?
Quite a few things might go wrong - this stuff actually is intended for experienced users that know each byte of the boot sector by its first name.

You have to learn to describe EXACTLY what you did - in the actual case, I suspect that it was you who created that "useless" boot sector with partition size 0. After all, you couldn't have followed the recipe exactly, because - at least until recently - you didn't know how to navigate with WDe to the FAT32 partitions on the "GPT disk".

---
MS-DOS forever!

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