Weird situation when deleted files

[Life2live]

Hello, I have a very weird situation. I put other hdd on my system, both are hdd sata, and the hdd that I linked to my system was also with 2 partitions, one with windows 7 and other with random old files and document. Also on my system I use windows 7. When I try to delete files from linked hdd in C partions, I noticed that it also deleted files from my system C. I deleted some files in linked hdd in program files, and it was also deleted from my system C program files. How you explain this? It is a bug? If you dont belive me, try it. Thanks

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By mistake did double post.