je to tak jak rika Jarda, ten dd nema mazat boot sector a partition table, ale zacatek te dosove partition, zde pro zvydave cast man fdisk:
DOS 6.x WARNING
The DOS 6.x FORMAT command looks for some information in the first sector of the data area of the
partition, and treats this information as more reliable than the information in the partition ta‐
ble. DOS FORMAT expects DOS FDISK to clear the first 512 bytes of the data area of a partition
whenever a size change occurs. DOS FORMAT will look at this extra information even if the /U flag
is given -- we consider this a bug in DOS FORMAT and DOS FDISK.
The bottom line is that if you use cfdisk or fdisk to change the size of a DOS partition table
entry, then you must also use dd to zero the first 512 bytes of that partition before using DOS
FORMAT to format the partition. For example, if you were using cfdisk to make a DOS partition ta‐
ble entry for /dev/sda1, then (after exiting fdisk or cfdisk and rebooting Linux so that the parti‐
tion table information is valid) you would use the command "dd if=/dev/zero of=/dev/sda1 bs=512
count=1" to zero the first 512 bytes of the partition.
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