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This HDD is a standard size HDD and should fit. But I am not familiar with the 420 so I suggest Googling "installing HDD in Dell 420" and you will find several links that might help. My experience was installing this HDD in a Dell 8920 and it was a snap and no additional cables were required. Is this HDD going to be your primary HDD or a secondary? If primary your OS disk should enable to to boot up and install the OS. If this new HDD is going to be a secondary drive you do not want to have an OS on it or you will have a conflict. Simply format it.
Sorry, there was a problem. Please try again later.From the picture on the Dell product page it looks like the case supports at least 2 drives in the bay if you're looking to install a second drive. If you're just looking to swap out the original HDD with this one it most definitely shouldn't be a problem.
Sorry, there was a problem. Please try again later.Of course all HD is 3.5" Internal HD this is a universal measurement, ie 3.5"; Regarding the installations are the standard for all HD SATA
Sorry, there was a problem. Please try again later.It should and if you are replacing the drive, you should not need any more cables. If you are adding then I think you will need to get a separate Sata cable as I don't think this drive comes with one.
Sorry, there was a problem. Please try again later.Based on the specs I see for the XPS 420, it has two 3.5" hard disk drive bays for factory installed SATA disks up to 1TB but it depends on what you bought it configured as. Are you really going to use Vista? Regardless, the OS install is fine. As for cabling you will need to have a SATA power cable to connect the drive to the motherboard. It's possible a spare/reserve is included if you did not get the PC with two drives already installed but maybe not.
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