how can I control the HDD using read(), write() in the kernel mode...?

I want to read and write "sometext" to the hard disk using my device driver.

/dev/sample_hdd0
/dev/sample_hdd1
/dev/sample_hdd2


my_read(uint32_t partition_id, char * buf, size_t count, loff_t offset)
{
/*Error Handling*/
numBytes = count;
pStart = pPartition->buffer + offset;
/* read from hard disk. */ <<--- I don't know how to read from my hard disk
__copy_to_user((void*)buf, pStart, numBytes);

}

my_write(uint32_t partition_id, const char * buf, size_t count, loff_t offset)
{
/*Error handling*/
numBytes = count;
pStart = pPartition->buffer + offset;
__copy_from_user((void*)pStart, buf, numBytes)
/*Write to hard disk*/ <<--- I don't know how to write to my hard disk
}



application


if ((fd = open("/dev/sample_hdd0", O_RDWR)) < 0){
/*someting....*/
if(read(fd,buff,1)==1) <<--- if I want to read...
/*something ...*/

my Question are

1) Is it possible to make the driver this way?
2) Do I need to make more program except for the device driver and the application?
3) How can I make the read(), write() function for this .....
4) IOCTL is ok .....Can I use this one ?? how ??


I just want to write and read something to hard disk using read(),write() in the kernel mode....

4)If I make the wrong way, can I get the sample code? or could you let me know the link for this program?


This is my first time to make the thread, if I did worng...let me know....
I'll modify that asap...

Why do you use your driver to read and write to hard disk? You can use raw device to access hard disk.