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How does OSS detect XP x64?

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Which mechanism does OSS use to detect XP Pro x64 OS?

I have 2 OS'es, both are XP Pro x64. The difference between these two are slipstreamed security fixes.
One OS is detected by OSS, the second one (with newer security fixes) not.

Hacking in bootwizz.oss solves the problem, but it would be nice to know why OSS detection does not work automatically.

Thanks in advance for the help.

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In general, Acronis has coded OSS to be very strict in detecting an OS (too strict, in my opinion). It's possible it's looking at one of the booting files (ntdetect.com or ntldr, for example). I don't have XP x64 so I have never tested it with OSS.

I have copied ntdetect.com and ntldr from the OS that was recognized. It is not a solution.
The OSS uses something else to detect XP.

Are the boot.ini files the same?

Are they both installed to boot from their own partition or do they both boot from the same partition?

The OSS cannot find even single OS (no other OS'es installed).

The boot.ini are exactly the same.

What build of OSS are you using?

Can you describe the installation method being used to install XP? Perhaps it's something in the setup that's causing the problem.

Are you installing to a standard NTFS partition (no special formatting)?

Since you know how to "hack" the BOOTWIZ.OSS file, have you looked in it to see if it's finding the XP booting files? These are listed near the end and include the partition ID. If it's not finding the files, it's probably having problems reading the partition or file system.