Rookie help of a simple problem on the hard drive become 4G 20G

Users questions: SAMSUNGsv2042h hard drive. To explain this scoring two parts, Part I: just got this drive, you can install the system, but put something and find the hard disk capacity is only 4.2G. This is fashion system is XPSP1. In the Computer Management inside. Also found that only 4.2 G and then restart the BIOS saw only 4.2G. But the surface of the hard disk read 20G (from the hard drive models can also be seen to be 20G) Part II: 16G hard drive began to get back onto the road of no return the. First, I use DM tools to re-partition. but then I was silly, D M listed on the list have two hard drives: one is SAMSUNGSV2042H. The other is 4320MB. That two hard drives (I halo is the only one computer hard drive.) So I picked the first here to find the hard disk partition SV2042H capacity is 20G. I Divided three areas: 5G +10 G +5 GDM all the way down no problem. Complete restart, then I would like to install the system, into XPSP1 CD-ROM to install the partition, select only one district 4G even further. At the time I was dizzy the BIOS back to the next or 4G. Part III: DOS, with FDISK tool, found in a 20G hard drive, but the following one sentence to the effect that: the total available space is 4.2G. So I do not understand that a 4G so I deleted the partition and re-divided. May result or 4G. Then I re-use DM had disappeared under the above said two hard drives Only one SV2042H the. Partition also in the BIOS, or 4G, under Part IV I won this hard drive to install to another machine as slave. Also found that only 4G 4G is the fifth part of the grid I set the hard disk into main plate. in another machine to install SP1 it installed the first time XPSP1 No problem, Bahrain would have to restart after the drive started from. But once they start self-test shows the following information: startingontrackseagatetechnologyLLc-discwixard **** informationth ewayyouwantit****DDoV.956A(C)1993-2001ontrackdateinternational.INC********************************** ******** PressspacebartobootfromdiskettentldrismissingpressANYkeytorestart press any key after the above information was ************** *********************** I'm at a loss here, and the hard drive installed in front of over XPSP1 used .******** ***************************** which GAO Ren know how to engage in, please refer to Teach me? Thanks ************************************* not as points, had wanted 100 points, so thank you to a certain extent make up
Experts answer: Oh, this is the first time I encountered, I feel the problem still lies in the sub- Area table, but they can not be explained a little bit, have difficulty Ah, I suggest that you simple low-level format the hard drive is the first low-level format the hard disk, if the problem still, I ... ... I can do about it, it is recommended to abandon it! Tired!
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