Disappeared HDD in Device Manager

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Hello,

i'm new to the board and like to send greetings to community and i hope someone can help me with a strange problem.

System: Windows 2000SP4
HDD: 2x SAMSUNG (IDE)
external HDD: SAMSUNG 250GB (S-ATA connected through USB)

It happens several weeks ago when i saved demos and stuff on my C: partition and copied/moved things to my external USB HDD.Suddenly first i got this \\.\PHYSICALDRIVE0 storage error and a STOP error followed by a BSOD.Because of my full HDD i didn't thought about anything strange at first (thought about a buffer problem) so i restarted the system and replugged the external USB drive again and started all over.

The issue now is,that i can't install some new software because the reference path can not be found and in the first C: main HDD is not listed in the Device Manager anymore but is working normaly.In Disk Manager both HDD are listed.But this \\.\PHYSICALDRIVE0 is entered as a drive name and the Adaptername is -UNKNOWN- for Drive 1 (C: and D: partitions)

What i already did:
- checked with MBR and Rootkit detection software for Rootkits.Everything okay.
- checked with GMER
Results:
Device -> \Driver\atapi \Device\Harddisk0\DR0 88F8E841
---- Files - GMER 1.0.15 ----
File C:\WINNT\system32\drivers\atapi.sys suspicious modification

Checked atapi.sys with online scanners and nothing found.
- cleaned the registry already
- uninstalled/reinstalled ATAPI/IDE drivers

Problem description:
The primary HDD is not listed in Device Manager but its listed in Disk Manager.When i reinstalled the IDE/ATAPI drivers the system scanned for devices but did not find the primary HDD.

Currently i'm stuck to track down this problem.Can someone help?

greetings
Gonzo
 
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