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  #1  
Old July 5th 19, 03:27 PM posted to alt.comp.os.windows-10
F Murtz
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Posts: 36
Default boot

On bootup "invalid partition table" comes up but then boots normally
after pressing enter.
how to fix?
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  #2  
Old July 5th 19, 06:52 PM posted to alt.comp.os.windows-10
Paul[_32_]
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Posts: 11,873
Default boot

F Murtz wrote:
On bootup "invalid partition table" comes up but then boots normally
after pressing enter.
how to fix?


The message is coming from the BIOS.

If a computer is set to "UEFI+CSM", it can do two boot
analysis before presenting the popup boot menu. The MBR
on a UEFI disk, has a "protective" 0xEE partition that
spans the disk surface. This is intended to prevent
legacy OSes from editing the partition table (as the
disk looks "full" with the giant slze partition so
declared).

If the CSM portion of a BIOS sniffs the protective partition,
it might be annoyed that no boot materials are present.

The UEFI analysis concludes something different, namely
that the disk has an ESP and materials suitable for booting.

The message could amount to a "warning" from the CSM half
of the BIOS (Compatibility Support Module).

If you enter the BIOS and change the BIOS type to "UEFI only"
instead of "UEFI+CSM", there's a good chance that warning
message will disappear. However, this may screw up
some of your bootable OSes (the ones made in the legacy era
perhaps).

The message is probably not an actual "broken" partition table
or missing materials.

You can use "disktype.exe /dev/sda" (Cygwin version) to check out
the partition table. You can do the same from Linux (sans .exe).
What disktype will show you, is a 16MB partition that Windows
won't admit to, which appears to have no recognizable file
system and contains "binary data". This is probably the
equivalent of a track 0 storage area, only larger. A track
might be a size around 8MB, and the 16MB GPT partition for it,
ensures the contents can be held without issue.

I've also seen a GPT disk that TestDisk marked some of
the partitions as being the wrong size. Fooling around with
Disk Management and resizing some stuff, may have pulled
that back into condition again. This only seemed to be an
issue for TestDisk. Nothing else noticed.

Paul
 




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