Question for disk sector-level I/O operations?

  • Thread starter Thread starter Frank
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F

Frank

Hi,all : p
I have encountered a question that how to read from/write to disk sector
directly by programme? Any reply is aprreciated :-p

Thanx very...much :D

--
Frank F.Han

+-----------------------------------------+
| winsays@:-)hotmail:-).com |
+-----------------------------------------+
 
Hi, Joep

Thanx for ur reply :-)
But I really dont know where it is, would u mind give more klew, please? I
very appreciate u :-|

Frank
 
Hi, Joep - and Frank.

That URL wrapped and led to a dead-end for me. Try this:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/createfile.asp

This page says:
"CreateFile
"The CreateFile function creates or opens a file, directory, physical disk,
volume, console buffer, tape drive, communications resource, mailslot, or
named pipe. The function returns a handle that can be used to access the
object."

I hope that's the one Frank needs.

RC
 
R. C. White said:
Hi, Joep - and Frank.

That URL wrapped and led to a dead-end for me. Try this:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base
/createfile.asp

This page says:
"CreateFile
"The CreateFile function creates or opens a file, directory, physical disk,
volume, console buffer, tape drive, communications resource, mailslot, or
named pipe. The function returns a handle that can be used to access the
object."

I hope that's the one Frank needs.
Click to expand...

Yep, thank you! That's how to do it (opeing physical disks/volumes) in
Windows. Basically you can treat entire disks and partitions as if they were
files. In DOS use BIOS interupts (int13hx).

regards,
Joep
 
Frank said:
Hi,all : p
I have encountered a question that how to read from/write to disk sector
directly by programme? Any reply is aprreciated :-p
Click to expand...

Just to make it a bit clearer, since it can take a few readings to
understand the subtleties in the article referenced in other replies, you
open a handle to C: or \\.\PhysicalDriveN, where N is an integer. Then you
have to use offset and length that is integer multiple of sector size.

This only applies to NT derivatives, and you need admin privilege to do it.

Phil
--
Philip D. Barila Windows DDK MVP
Seagate Technology, LLC
(720) 684-1842
As if I need to say it: Not speaking for Seagate.
E-mail address is pointed at a domain squatter. Use reply-to instead.
 
hi,phil

I have another question for using CreateFile(...).

For instance: If I use CreateFile() open d: drive, could I access the sector
include information of file system (fat/ntfs)?

very thanx :-p
Frank
 
Frank said:
hi,phil

I have another question for using CreateFile(...).

For instance: If I use CreateFile() open d: drive, could I access the sector
include information of file system (fat/ntfs)?
Click to expand...

You can read the sectors containing FS data. You'll have to sort out the
meaning of the data you get back. What do you really want to do?

Phil
--
Philip D. Barila Windows DDK MVP
Seagate Technology, LLC
(720) 684-1842
As if I need to say it: Not speaking for Seagate.
E-mail address is pointed at a domain squatter. Use reply-to instead.
 
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