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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 DEBIAN

scrounge-ntfs

scrounge-ntfs(8)					    BSD System Manager's Manual 					  scrounge-ntfs(8)

NAME

     scrounge-ntfs -- helps retrieve data from corrupted NTFS partitions

SYNOPSIS

     scrounge-ntfs -l disk
     scrounge-ntfs -s disk
     scrounge-ntfs [-m mftoffset] [-c clustersize] [-o outdir] disk start end

DESCRIPTION

     scrounge-ntfs is a utility that can rescue data from corrupted NTFS partitions. It writes the files retrieved to another working file system.
     Certain information about the partition needs to be known in advance.

     The -l mode is meant to be run in advance of the data corruption, with the output stored away in a file. This allows scrounge-ntfs to recover
     data reliably. See the 'NOTES' section below for recover info when this isn't the case.

OPTIONS

     The options are as follows:

     -c 	 The cluster size (in sectors). When not specified a default of 8 is used.

     -l 	 List partition information for a drive. This will only work when the partition table for the given drive is intact.

     -m 	 When recovering data this specifies the location of the MFT from the beginning of the partition (in sectors). If not specified
		 then no directory information can be used, that is, all rescued files will be written to the same directory.

     -o 	 Directory to put rescued files in. If not specified then files will be placed in the current directory.

     -s 	 Search disk for partition information. (Not implemented yet).

     disk	 The raw device used to access the disk which contains the NTFS partition to rescue files from. eg: '/dev/hdc'

     start	 The beginning of the NTFS partition (in sectors).

     end	 The end of the NTFS partition (in sectors)

NOTES

     If you plan on using this program sucessfully you should prepare in advance by storing a copy of the partition information. Use the -l option
     to do this. Eventually searching for disk partition information will be implemented, which will solve this problem.

     When only one partition exists on a disk or you want to rescue the first partition there are ways to guess at the sector sizes and MFT loca-
     tion. See the scrounge-ntfs web page for more info:

     http://memberwebs.com/swalter/software/scrounge/

AUTHOR

     Stef Walter <stef@memberwebs.com>

scrounge-ntfs							   June 1, 2019 						     scrounge-ntfs