Read/Write bytes directly from hard drive

From: asharma (theArjunSharma_at_gmail.com)
Date: 04/22/05 

Date: 22 Apr 2005 13:32:06 -0700

We are writing a disk partitioner from scratch. We were not sure how to
access any byte from the disk, including the master table or any other
data. Are there any system calls that handle read/write operations?

Thanks,
Arjun Sharma, Jan Zankowski, Mike Gnozzio