Just found a working Seagate SCSI 2GB HDD and prepared it well.
But when I use 2 HDDs, it doesn't detect one of them :confused:
I set first HDD as ID0 and the second as ID1 but don't know what's wrong

It is, I have done this myself a few times. You need to tell WinUAE, via a setting in the harddrive options, if I remember correctly.
Then it shuld be possible to find the harddrive on the amiga/uae side using toolbox and then mount and format the drive with the proper file system..
Would you explain more? and what file system, FFS?
( The new HDD makes sound like the jet engine at startup :lol: )