format each cell individually
The superlative of efficient is "most efficient."
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Fluorine (F), element number 9
Databases use a table format, with Microsoft Access being one of the most widely used.
A Sonicare Toothbrush is actually very efficient in cleaning your entire mouth. It can get in between your teeth to prevent gingivitis, and also makes it easier to clean the gums, which is where most people tend to ignore.
Your question is unclear. There is no main "HDD passcode" of any sort. There is usually a Master File Table (MFT) or a Master Boot Record (MBR) on most hard drives. There are utilities to clear those. If you would like to format your entire hard drive, you can use the Windows command line program "format" to clear your entire drive (and all of your programs and files as well). Please revise or clarify your question in the discussion page so that we can be of better assistance.
Spur Gear is the most efficient
More efficient and most efficient are the comparative and superlative forms of "efficient".
A screw is the most efficient.