Sector 0 in a Compactflash

• Aug 17, 2004

• #21

N

nooknikz

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identify device command compact flash

Hi goshka ,
You have information , how to PIC interface CF or SC ?

THANK YOU

 

• Aug 19, 2004

• #22

goshka

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xp sector 0 dump

AVR:
https://www.mcselec.com/an_127.htm
https://www.mcselec.com/an_123.htm

If anybody is needed AVR <-> CF/MMC interface C source code, i can sent it via email.
No problem.

 

• Aug 19, 2004

• #23

goshka

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sandisk boot record

ie excuse, i can't upload it via proxy...

 

• Aug 25, 2004

• #24

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mar_ori

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windows xp bpb_rsvdseccnt

ok, first fat is at sector 33. But my question is, how can i know how many hidden sectors there is in the CF. If MBR is located in LBA=0 is very easy, but in all my cards MBR is in others sectors. My method is search for 'jump code' at start of each sectors from LBA = 0, but i don't think that a software which reads CF do it like me.

I hope that my question is understood.

Thanks.

Click to expand...

Hi

I had the same problem.
What has been confusing me most is that when i do a dump of the CF to a file and then dump that file again to the CF (i've done this using linux), the CF is still readable on windows and the boot sector is now actually on the sector 0.
About the code that apeared on the sector 0 (before the dump stuff) is quite similar to this:
http://www.geocities.com/thestarman3/asm/mbr/Win2kmbr.htm#CHS
But on a nikon card (made by sandisk) it is differerent, almost all zeros and in the end 0x55AA.

To know how many hidden sectors are there just do this:
Exec an identify device command and read the word sectors per track (index 12 and 13), this will tell you how many sectors to jump.
Example: on a 32MB card you will jump 32 sectors.
And to know if there is the need to jump i look for the first byte on the sector and expect that it will be 0xEB

Hope this helps

 

• Sep 3, 2004

• #25

Tulkas

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read mbr compact flash

Thank you very very much, I like the method that you have used.

Thanks.

 

• Sep 8, 2004

• #26

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stockerc

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adding boot sector to a cf card

goshka:

I need AVR <-> CF/MMC interface C source code, can you sent it via email.

stockerc@jlonline.com

 

• Sep 24, 2004

• #27

amazonite

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compact flash boot sectors

Dear all:
I have a problem. I don't know how to see the sector 0 of HDD in Hex Code Format in my PC?Is use Debug ? If anyone know how to do.Please tell me. My E-mail is bear@msp.adsldns.org
Thank you very much.

 

• Sep 24, 2004

• #28

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mipedja

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cf card identify sector cluster

Download program winhex, and you will be able to see all sectors of hard disk, or memoy cards. Just click on tools->Opendisk
www.winhex.com

 

• Sep 30, 2004

• #29

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kerubín_spacial

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compactflash hidden sector

Hello...I'm asking for help 'bout how can I read from an SD Card with an 8051 family microcontroller. Does anyone know 'bout an already-made free code to do this? I suppose that this question is similar to the "how to interface a CF Card and an AVR" one, but I have no idea 'bout how to use an AVR or how to traslate that code to an 8051's code and I don't know neither if the structure and the way a CF Card works is the same to the way an SD Cards does.

Please help me! This is one part of my final project, I accept any kind of orientation!

Thanx!!!

 

• Oct 5, 2004

• #30

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James Bond

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bpb mbr location on mmc/sd cards

goshka:

I need AVR <-> CF/MMC interface C source code, can you sent it via email.

ldz1978@yahoo.com.cn

 

• Dec 4, 2004

• #31

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david401040

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avr cf card

this is a message for Gorilla

Thanks for explaining how ot get from MBR to FAT . I think !

As I see it (for your first sector):

00h - jump code (EB 3C) + NOP (90)
0Bh - bytes per sector (WORD) = 512
0Dh - sectors per cluster (BYTE) = 4
0Eh - reserved sectors (WORD) = 1
10h - copies of FAT (BYTE) = 2
11h - max Root Dir entries (WORD) = 512
13h - numbers of sectors for partition < 32 MB (WORD) = 62,560 (=32,030,720 bytes on card)
15h - media discriptor (BYTE) = F8 (hard disk)
16h - sectors per FAT (WORD) = 61
1Ch - hidden sectors in partition (DWORD) = 32
20h - numbers of sectors for partition >= 32 MB (DWORD) = 0
26h - Extedned Signature (BYTE) = 29h
2Bh - Volume Name (11 bytes) = NO NAME
36h - FAT name (8 bytes) = FAT16
1FEh - Executable Marker = 55AA

So reserved sectors + hidden sectors = 33, that means the first FAT should be at sector 33. After the 2 FATs you should find the first directory entry.

this has taken days of reading stuff on net and getting me no where so thanks

 

• Dec 4, 2004

• #32

V

virus

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hdd sector zero is position

Hello all,
How could I read LBA = 0?

I had set up my hardware and suscessfully read the buffer after IDENTIFY (0xEC) command. But until now (after many attempt), I still can't read the buffer with READ_SECTOR with LBA = 0. All the buffer are 0 after that command.

Can someone help me please?

Thanks & best regards.

 

• Dec 5, 2004

• #33

V

virus

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add mbr to compact flash

Hello all,

Get it. Had my data port ddr set wrongly.

Thanks & best regards.

 

• Dec 8, 2004

• #34

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reju_r

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cf sector 0 info

h**p://www.prllc.com/products/FlashFileCF.zip
what is the password for this file

 

• Mar 6, 2005

• #35

U

ur

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read hidden sectors flash

Message to goshka GOSHKA:

1. Yes.
h**p://www.telesys.ru/wwwboards/mcontrol/644/messages/38443.shtml

Link does not provide correct keys for unzipping actual downloads!!!

2. can you send me AVR C-code for SD/MMC handling.

to: for_udo@yahoo.de

 

• Mar 22, 2005

• #36

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ungugu

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sd card mbr dump

can you send me a copy as well
thanks

enewsletter@gmail.com

 

• Mar 24, 2005

• #37

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eubeltran

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prllc flashfile

Hi,

can you send me a copy too??
thanks

eubeltran01@hotmail.com

 

• Mar 29, 2005

• #38

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ungugu

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Look for pkcrack to crack it. the password contains several keys!

 

• Apr 7, 2005

• #39

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repzak

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goshka:

can i have the AVR FAT?

sunsetdk@ofir.dk

 

• Apr 21, 2005

• #40

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kerubín_spacial

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Could Goshka or any of you microcontroller brother send me the AVR C-code for SD/MMC handling and the zip crack please? It will be the most usefull thing ever...!