On friday i've finished movind my data to a new hard drive supplied with my ODW. Drive type is Samsung SV4002H 40 GB.
We don't ship Samsung hard disks with the ODW yet? You bought this yourself or..?
The problem is that the Samsung HDD DOES NOT WORK together with any device on one bus. It's no matter whether it's master or slave.
Have you tried cable select mode? Are you using the cables we supplied, or some of your own? Are you sure to connect it, when forced set to master/slave, to the correct end of the cable (note the final connector is always master, the middle one is always slave.. you should never ever have to set a jumper since 80-core cables came into existance. Cable select is a mind-numbingly simple technology to implement)
If they are your own make sure they are 80-core, and use flat ones if possible. I know we shipped rounded ones unfortunately with a lot of systems.
Are you sure it does not work even in tandem with the Samsung combo drive? We rely on those being configured for cable select from the factory and thrown at the end of the cable.
Pegasos does not start up for a while, when at last openfirmware prompt comes up i see that there are no devices on IDE bus to which i connected the drive. HDD led is constantly on.
The Pegasos will stall during boot if it's looking for devices and they at least attempt or seem to respond to the standard ATA reset. It might be that the drive really does not spin up fast enough (even 5400rpm disks can be a little slow to do that) in the first place, and therefor it would do this like your 20GB did. This is a known firmware "problem" which we could solve in the next update possibly.
This problem is even more strange because Samsung drives utilize Marvell chips. This means that Marvell's products are incompatible...
Marvell's chips are incompatible with what exactly? Please don't make rash gestures like this.