dd didn't stop at partition boundary?

[James McDonald]

jorg raskowski wrote:
> Man-wai Chang wrote:
>> I was trying to copy a partiton of 9.7G (/dev/sda1) when mounted with 
>> partition id being 27 (Unknown) to a file in an NTFS partition 
>> (/dev/sda3):
>>
>> dd if=/dev/sda1 of=/dev/sda3/samsung.bin
>>
>> dd didn't stop after samsung.bin reached the size of 9.7G and went 
>> through 13G. I aborted it.
>>
>> Why?
>>
>
Shouldn't the command be:

mkdir /mnt/sda3
mount -t ntfs /dev/sda3 /mnt/sda3

dd if=/dev/sda1 of=/mnt/sda3/samsung.bin