OK, this is the analysis of the MBR you have posted ....
MBR Analyzer v1.1.1
File : C:\Users\Gary R\Downloads\Dump_Hdd0_DR0.txt
--------------------------------------------------------------
--OFFSET-- 0-1-2-3-4-5-6-7-8-9-A-B-C-D-E-F- 0123456789ABCDEF
0x00000000 33C08ED0BC007C8EC08ED8BE007CBF00 3À.м.|.À.ؾ.|¿.
0x00000010 06B90002FCF3A450681C06CBFBB90400 .¹..üó¤Ph..Ëû¹..
0x00000020 BDBE07807E00007C0B0F85100183C510 ½¾..~..|......Å.
0x00000030 E2F1CD1888560055C6461105C6461000 âñÍ..V.UÆF..ÆF..
0x00000040 B441BBAA55CD135D720F81FB55AA7509 ´A»ªUÍ.]r..ûUªu.
0x00000050 F7C101007403FE46106660807E100074 ÷Á..t.þF.f`.~..t
0x00000060 2666680000000066FF76086800006800 &fh....f.v.h..h.
0x00000070 7C680100681000B4428A56008BF4CD13 |h..h..´B.V..ôÍ.
0x00000080 9F83C4109EEB14B80102BB007C8A5600 ..Ä..ë.¸..».|.V.
0x00000090 8A76018A4E028A6E03CD136661731EFE .v..N..n.Í.fas.þ
0x000000A0 4E110F850C00807E00800F848A00B280 N......~......².
0x000000B0 EB825532E48A5600CD135DEB9C813EFE ë.U2ä.V.Í.]ë..>þ
0x000000C0 7D55AA756EFF7600E88A000F851500B0 }Uªun.v.è......°
0x000000D0 D1E664E87F00B0DFE660E87800B0FFE6 Ñædè..°ßæ`èx.°.æ
0x000000E0 64E87100B800BBCD1A6623C0753B6681 dèq.¸.»Í.f#Àu;f.
0x000000F0 FB54435041753281F90201722C666807 ûTCPAu2.ù..r,fh.
0x00000100 BB000066680002000066680800000066 »..fh....fh....f
0x00000110 53665366556668000000006668007C00 SfSfUfh....fh.|.
0x00000120 00666168000007CD1A5A32F6EA007C00 .fah...Í.Z2öê.|.
0x00000130 00CD18A0B707EB08A0B607EB03A0B507 .Í..·.ë..¶.ë..µ.
0x00000140 32E40500078BF0AC3C0074FCBB0700B4 2ä....ð¬<.tü»..´
0x00000150 0ECD10EBF22BC9E464EB002402E0F824 .Í.ëò+Éädë.$.àø$
0x00000160 02C3496E76616C696420706172746974 .ÃInvalid partit
0x00000170 696F6E207461626C65004572726F7220 ion table.Error
0x00000180 6C6F6164696E67206F7065726174696E loading operatin
0x00000190 672073797374656D004D697373696E67 g system.Missing
0x000001A0 206F7065726174696E67207379737465 operating syste
0x000001B0 6D00000000627A995C9356EB00008020 m....bz.\.Vë...
0x000001C0 210007FEFFFF0008000000D842250000 !..þ.......ØB%..
0x000001D0 00000000000000000000000000000000 ................
0x000001E0 00000000000000000000000000000000 ................
0x000001F0 000000000000000000000000000055AA ..............Uª
---------------------------[ MBR ]----------------------------
MBR_CODE : Vista MBR Code
MD5 : 86AC6796445E71037CF547B83B0F420E
SHA1 : C8432BEE65E28217B0714E3F6C5451759C138BA9
PARTITIONS : 1
DISK_SIGNATURE : 5C9356EB
SIGNATURE_ID : AA55h
-----------------------[ PARTITION 1 ]------------------------
BOOTABLE : YES
PARTITION_TYPE : 0x07 ( NTFS / HPFS)
PARTITION_SIZE : 298 Go
STARTING_SECTOR : 2048
ENDING_SECTOR : 625139712
TOTAL_SECTORS : 625137664
The section I've highlighted in red and green is your Partition Table. The red part indicates your first partition, the area in green indicate any further partitions (in a MBR bootable drive your disk may have a maximum of 4).
This shows you have a
single partition only, and that it is a bootable partition (the
80 at the start of the red section tells us it is bootable) that it is of type
07 (NTFS) formatted. Data in the section above the red highlighted area tells us that it is using a Vista MBR code.
As you can see the green section is full of 00s, which tells us there are
no further partitions.
The 55AA at the end are just check digits, and are present on all functioning drives.
The only reason I can think of for your drive having an unaccessible area, is that the drive has some damaged sectors, and that your drive controller has restricted access to that area. If you do a
scandsk check on a drive, it will often find damaged sectors and "fix" them. What it actually does is mark them as damaged and notify the disk controller so that it will not write data to those areas of the disk.
The area on your disk is large, and it's unusual for such a large section of damage, so it's probably advisable to perform an in depth scan of your hard drive with an appropriate disk scanning tool, but that's beyond the scope of this forum. One of the hardware forums I linked you to earlier can probably help you in that regard.
But we can see that there is no hidden partition on your computer, since even hidden partitions must load via the Partition Table, and are indicated on it. Like the 07 code indicates NTFS, there are codes for various hidden types as well, and none of them are present in your dump.