OpenBSD downgrades HDD transfer mode, I want to upgrade it WITHOUT BOOTING Post: 302288175

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Operating Systems BSD OpenBSD downgrades HDD transfer mode, I want to upgrade it WITHOUT BOOTING Post 302288175 by fiori_musicali on Monday 16th of February 2009 04:12:30 PM

02-16-2009

Registered User

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?

fiori_musicali

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isohybrid

isohybrid(1)						      General Commands Manual						      isohybrid(1)

NAME

       isohybrid -- Post-process an ISO 9660 image generated with mkisofs or genisoimage to allow hybrid booting as a CD-ROM or as a hard disk.

SYNOPSIS

       isohybrid [OPTIONS] <boot.iso>

DESCRIPTION

       The isohybrid utility modifies a an ISO 9660 image generated with mkisofs, genisoimage, or compatible utilities, to be bootable as a CD-ROM
       or as a hard disk.

OPTIONS

       -h <X>
	      Number of default geometry heads

       -s <X>
	      Number of default geometry sectors

       -e <X>, --entry <X>
	      Specify parititon entry number (1-4)

       -o <X>, --offset <X>
	      Specify partition offset (default 0)

       -t <X>, --type <X>
	      Specify MBR ID (default random)

       -u, --uefi
	      Build EFI bootable image

       -m, --mac
	      Add Apple File Protocol partition table support

       --forcehd0
	      Assume we are laoded as disk ID 0

       --ctrlhd0
	      Assume disk ID 0 if the Ctrl key is pressed

       --partok
	      Allow booting from within a partition

       -?, --help
	      Display help

       -v, --verbose
	      Display verbose output

       -V, --version
	      Display version information

SEE ALSO

       mkisofs(1)

isohybrid							    17 Jan 2014 						      isohybrid(1)