How to repair HDD?

4 days ago I brought a new Toshiba 1 TB HDD. I have installed windows 7 on this with a 100 GB partition on it. I also created 3 more partition on it which are 200 GB, 100 GB, 100 GB respectively. I keep remaining space unallocated. Yesterday I was wondering to create 2 more partition. So I open EaseUS partition master free edition and created 2 new partition which are 100 GB and 50 GB respectively {There Drive Letters is (G:) and (K:) respectively.}. I applied this operations. I exit from EaseUS partition master and shut down the PC. After an hour I stated my PC and again I open EaseUS partition master and click wipe data on drive (G:). EaseUS partition master deleted the partition and show that space is unallocated. But windows explorer is showing a the disk with the label removed which I created and new label is local disk(G:) and size is 0 byte. When I click repair on properties. It says can't access the disk. I also tried to create a new disk with Drive Letter (G:). But I EaseUS partition master dont show the Drive Letter (G:). I even tried to rebuild MBR. But nothing happen. Now I Want or re map all my content on the disk. Is it possible? (I don't know much about disk and disk disk management. I am using EaseUS partition master 11.5.)

how can I delete the disk from windows explorer and get back the Drive Letter (G:)?

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