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OpenBSD downgrades HDD transfer mode, I want to upgrade it WITHOUT BOOTING

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Operating Systems BSD OpenBSD downgrades HDD transfer mode, I want to upgrade it WITHOUT BOOTING
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Old 02-16-2009
OpenBSD downgrades HDD transfer mode, I want to upgrade it WITHOUT BOOTING
Hi,

I have a crappy hard disk and am trying to back up stuff from it onto my newer hopefully less crappy disk. There are dead sectors on the disk and some files can't be read (at all) so OpenBSD downgrades the transfer mode down until PIO mode 4. I noticed the transfer speed slowing down extremely, and I would guess it's due to these downgrades, which are done when reading certain blocks continuously produces errors. But there are files on the disk that ARE READABLE and I don't want to reboot every time I end up on a trashed area on the disk, since the rest is fine and can be read in Ultra-DMA mode 5.

I looked it up a bit, and found out that apparently you can change device flags - including the transfer modes - with the config/UKC (User Kernel Config) utility, but AFAIK that is for rewriting the kernel image without recompiling. When OpenBSD downgrades the DMA modes, it's obviously doing something else, and I just need to do the reverse operation. The point being: if it can be downgraded without booting, it can be changed, and therefore upgraded without booting.

Anyone know how to upgrade from PIO4 without a reboot?
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LEARN ABOUT MINIX

fdisk

FDISK(8)						      System Manager's Manual							  FDISK(8)

NAME

       fdisk - partition a hard disk [IBM]

SYNOPSIS

       fdisk [-hm] [-sn] [file]

OPTIONS

       -h     Number of disk heads is m

       -s     Number of sectors per track is n

EXAMPLES

       fdisk /dev/hd0	   # Examine disk partitions

       fdisk -h9 /dev/hd0  # Examine disk with 9 heads

DESCRIPTION

       When  fdisk  starts  up,  it reads in the partition table and displays it.  It then presents a menu to allow the user to modify partitions,
       store the partition table on a file, or load it from a file.  Partitions can be marked as MINIX, DOS or other, as well as  active  or  not.
       Using fdisk is self-explanatory.  However, be aware that repartitioning a disk will cause information on it to be lost.	Rebooting the sys-
       tem immediately is mandatory after changing partition sizes and parameters.  MINIX, XENIX, PC-IX, and MS-DOS all have  different  partition
       numbering schemes.  Thus when using multiple systems on the same disk, be careful.

       Note that MINIX, unlike MS-DOS , cannot access the last sector in a partition with an odd number of sectors.  The reason that odd partition
       sizes do not cause a problem with MS-DOS is that MS-DOS allocates disk space in units of 512-byte sectors, whereas MINIX  uses  1K  blocks.
       Fdisk has a variety of other features that can be seen by typing h.

       Fdisk normally knows the geometry of the device by asking the driver.  You can use the -h and -s options to override the numbers found.

SEE ALSO

       part(8).

																	  FDISK(8)