Originally Posted by
maver1ck
I can't speak for what you have on either of your hard drives (nor do I know if you bought this new or used), but even if the replacement "spare" hard drive was purchased directly from Siemens, it would not have had all of the software on it that you need to run your machine, nor would it be configured to allow your specific machine to run properly. Only Cincinnati was able to do this, and all they could do was get it back to approximately what was shipped to you. Since software versions changed quickly back then, unless the hard drive was purchased as a spare for this machine when it was new, the chances of having a plug and play spare hard drive are practically non-existent.
Based on real world experience with people buying used machines around here, what you received for a spare was likely a hard drive pulled from a similar machine that was taken out of service, one the distributor had laying around for troubleshooting or one that failed for one reason or another and was replaced leaving the seller with it as an extra.
If you made a machine dependent data backup of your original hard drive, you can try restoring this to the new hard drive. If the software versions of the original and new hard drives are compatible, it "should" restore your machine to the working condition of the original hard drive. I say should because this process was sometimes glitchy and particularly if the software versions were not the same, could create issues when it is restored. Just be sure to make a new backup before you restore the old one in case it creates more issues than it solves. I should also mention any changes to the machine's setup since the machine dependent data backup was created will have been lost, so if items such as tool change height, spindle orientation (depending on vintage), etc. have been changed, they will go back to the earlier settings and could cause a crash so be careful when testing the machine after this.