How do I corrupt an mdb intentionally for test purposes
How to launch the Detect and Repair Tool you may see below


Start MS Access 2007.
Click the MS Access button and click the PowerPoint options button.
Select the Resource Tab.
Click the Diagnose button.


But also you can get more resources to solve problem .mdb file

http://www.itninja.com/question/copying-1-2-gb-mdb-from-pc-to-network

Ultimate solution you may use only if previous methods didn't work, that denotes your .mdb corruption is severe, see and try it http://www.mdb.openfiletool.com/ MDB Open File Tool