Drive Image (PQDI) is a software disk cloning package for Intel-based computers. The software was developed and distributed by the former PowerQuest Corporation. Drive Image version 7 became the basis for Norton Ghost 9.0, which was released to retail markets in August 2004. Ghost was a competing product, developed by Binary Research, before Symantec bought the company in 1998. This also explains the different file extensions used for Ghost image files: formerly it was .gho, now in versions 9.0 and above it is .v2i.