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Old 05-09-2017, 05:49 AM   #1
mad11
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Corrupt boot order


A brief description of the problem in booting the system in correct order.
Is down to a floppy at 0x00 in boot order what info I have been able to grab from it. follows.

COMMAND LINE FROM FLOPPY.

DiSK IS FD0 1440K C/H/S/=80/2/18 (FAT/FAT) EDD OFF, R.W.
USING SAFE iNT 15h access to high memory.
code 1348,meminfo 168, cmdline7, stack 512
Total size needed =2035bytes,allocating 2k.
Old dos memory at 0x9f400(map says 0x9f400).loading at 0x9ec001588: 0xffff 15e801: 0x3c000x3ae8
Int 13 08: success,count=0,bpt=0000:0000
Disc probing gives drive shift limit : 0x01
Old : Int13 =f000a800 Int 15 =f000f859 In1e=f000efc7
New: Int13=9ec0000a Int 15=9ec002d1 Int1e =9ec00524

Bios View (Diskman4)
0x00 FDD1 N
0X01 FDD2 N
0X-2 BIOS HDD1 Y

I was able get to and wipe 0X01, But was unable to get to 0x00 in the boot order to wipe it.
I have the partition structure of 0x01 if the info is required: As follows.

Part table 0x01. sector 0x00000
1) C/120 H/6e S/24 C/16e H/68 S/25 Sector 65727020 : Sectors 61207373: Size:MB 795662: part type :74
2) C/06b H/79 S/20 C/00a H/79 S/0d Sector 4f490000: Sectors 20202020: Size MB 263172: part type 65
3) C/159 H/20 S/13 C/144 H/4d S/13 Sector 2020534f: Sectors 53595320: SizeMB 682794 : part type 53 : ontrack DM6 Aux3
4) C/041 H/01 S/00 C/060 H/00 S/07 Sector e9006a66: Sectors 0000ff3b: SizeMB 000031: Part type bb

Also seems to be self replicating. Any help gratefully received: As I am a complete novice I think their may be a way in fixing this but don't know enough about the internal structure as yet.

I have to use library at the moment so cannot reply asoon as would like but will check it daily for replys and am unable to search for similar posts through this browser possible as in "private mode".
 
Old 05-09-2017, 08:49 AM   #2
mad11
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Hi. Have a update i am sat in a:\ at the moment and would like to be able to remount hirens 15.2 that is sitting in a:\ in to the correct drive so as to be able to dismount drive a:\

I must add that their is no hdd connected to the system at the moment and is running 512 mem i think i am sat in a loop and want out. lol

any help appreciated.
 
Old 05-09-2017, 08:52 AM   #3
mad11
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Hi. Have a update i am sat in a:\ at the moment and would like to be able to remount hirens 15.2 that is sitting in a:\ in to the correct drive so as to be able to dismount drive a:\

I must add that their is no hdd connected to the system at the moment and is running 512 mem i think i am sat in a loop and want out. lol Their is a switch in diskman4 to initiate 19h to reset the high mem would that assist me in any way in removing or resetting the boot order.

any help appreciated.
 
Old 05-10-2017, 10:07 AM   #4
mad11
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more info

Hello. Again have tried to get through with konboot on hirens 15.2. Here is the cmd line as follows. from live cd boot this is the edit function of the cmd line.

Set kon=konboot.gz
find --set-root /hbcd/boot/konboot.gz :set iscd=
find --set-root /hbcd/boot/konboot.gz && set kon=konboot.gz
map --mem /hbcd/boot/%kon% (fd0)
map --hook
chainload (fd0)+1
if not "%iscd%=="(cd)" paus --wait=2 hdd swap
if not "%iscd%=="~(cd)" map (hd1) (hd0)
map --hook
rootnoverify (fd0)
map --floppies=1

Ican see by the thread posts their have been two replys but cannot see them my end seem to have a network connection to this forum when i log out i am still logged in (not sure as to why or if its a real issue).

Last edited by mad11; 05-16-2017 at 09:07 AM. Reason: more info on what i was doing at the time.
 
Old 05-15-2017, 08:20 AM   #5
mad11
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HELLO Again I should have put this as the tag for the post:

Found BPB Found with 0xeb(jmp) leading to boot sector.
 
Old 05-25-2017, 07:42 AM   #6
mad11
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corrupt boot order

HI Is their any way I can take it back to the 15h high memory settings rather than the 13h high memory setting the boot takes me to as this is the issue when booting the cd (live disk) o get all root access.

Also the MBR with it having a fractional sector (and a fractional head) redoing the mbr is not at the moment possible.

Is their a way to change the mbr or bpb. "From the floppy to disk" or some program that might give me a way in through command, dos or grub.

I have come across this on Hirens 15.2 which is what I am using and the way the memory is working seems very similar if not the same,

Could some one who understands what it all means Possible give me a poiner,while I read up and try so understand what it all means.
https://www.google.co.uk/url?sa=t&rc...v3fRag&cad=rja

Although my info doesn't show a fractional sector it does when I try to fixmbr with the memory switch in their I am well stuck as in which way to go

Last edited by mad11; 05-25-2017 at 07:57 AM. Reason: new info
 
Old 05-26-2017, 06:28 AM   #7
mad11
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All good now, all I had to do ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- easy really.
 
Old 05-30-2017, 05:21 AM   #8
mad11
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Boot Virus

Hi I would have posted my fix.
But I am still unable to see any of the reply`s to me post don't know why that is but thought I would give some info as to what was going on. Just in case it helps some one else.

Its a "BOOT VIRUS" corrupting the boot up it loads the live disk to A:\ and B:\ even though it`s all running through the hdd it starts else ware. And unmounts the access point that's required to fix the problem.

I removed over 200 virus`s from hard drive and got the boot to start correctly.
 
  


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