-rw------- 1 root root 100.0G Jan 25 13:41 Exchange-flat.vmdk
-rw------- 1 root root 471 Jan 25 13:45 Exchange.vmdk
-rw------- 1 root root 6.3M Feb 3 13:28 Exchange_1-000001-ctk.vmdk
-rw------- 1 root root 560.2M Feb 3 13:30 Exchange_1-000001-delta.vmdk
-rw------- 1 root root 393 Feb 3 13:27 Exchange_1-000001.vmdk
-rw------- 1 root root 6.3M Jan 30 15:01 Exchange_1-ctk.vmdk
-rw------- 1 root root 100.0G Jan 30 15:01 Exchange_1-flat.vmdk
-rw------- 1 root root 535 Jan 30 14:58 Exchange_1.vmdk
It seems that the file exchange_1 is the current one, and Exchange is orphaned
* Exchange-flat.vmdk hasnt been used since Jan 25
* Exchange_1 was modifiled Jan 30 and you have a snapshot on that machine, thats why you have these files, Exchange_1-000001-ctk.vmdk,Exchange_1-000001-delta.vmdk,Exchange_1-000001.vmdk.