Hi,
As per naming convention it look like snapshot. Howevver , when you right click VM and select hard disk, what is file name you see it. If you see sf2000-2.vmdk , then that mean , you are not using rest of file so you can delete it. If not , then there is snapshot on VM. you can consolidate it by creating one more snapshot and doing delete all, which will push data from snapshot to base disk.
Regards
Mohammed