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Is this a secondary drive or the OS drive?<br />
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If the OS drive simply boot off whatever OS install CD you wish to install and when you're setting up you'll have the option to format. &nbsp;That would be the easiest since it's on the path to a reinstall which I would assume is the ultimate goal.
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Check see if your system has restore partition so you can restore it to manufacturing date, it will format and make system like new :o)<br />
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If you have recovery CD that comes with system, insert in and do installation, it will format the drive and install new. 
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what is the easiest way to reformat hardr drive on a Dell Optiplex 745 desktop computer
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what is the easiest way to reformat hardr drive on a Dell Optiplex 745 desktop computer

how to reformat hardr drive

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.