Today I just was wondering if its possible to check if my screen really supports 24 bit color and was searching on google. Found the following on line tool, which is too good...!
http://www.lagom.nl/lcd-test/
it has so many tests that check almost all features of your LCD, like viewing angle, refresh speed apart from color depth & resolution. This really is a cool site..!
Wednesday, June 18, 2008
Saturday, June 14, 2008
Multi boot system - partition reorg
I normally have 5 / 6 OS on my system on different partitions. And I keep removing / replacing them. This also involves deleting / adding new / moving partitions. everything was fine till one day when I ran testdisk (to fix an issue that arose due to the way vista handles partitions) that changed the partition numbers of my partition. Now I was not able to load the OS with changed partition numbers.
I had heard about GUID is sort of disk signature which would have hanged and causing the issue. Searched net with GUID, but could not find any helpful links (later I realized that this is referred to UUID in linux/ubuntu parlance).
I tried to manually edit the partition number during the grub menu & boot. Now the problem became even more stranger! though I set the root as partition I wanted to boot, it was booting another OS! I was going crazy!!! I thought if I could only capture those messages that scroll on the screen while it boots and I found few links that make use of serial terminal:
http://www.techanswerguy.com/2007/09/capturing-boot-messages-in-linux-via.html
Since I was not having another comp & also I was on laptop without serial port, this is ruled out. now the only option for me was to verify my grub menu entry thoroughly and this time I found the silly mistake I was making:
title Linux Mint, kernel 2.6.22-14-generic (recovery mode) (on /dev/sda13)
root (hd0,12)
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sda14 ro single
though I was changing the partition number in "root" part, I missed changing the partition number on "kernel" line. This was causing lot of trouble rendering most of my OSes un usable. But I still was having issues with ubuntu. This is because, ubuntu uses UUID and not the partition nubers (Probably this causd me to search for GUID earlier & miss the obvious partition number for mint OS). A search with UUID & Ubuntu revealed how to fix this. This needs updating the UUID at 3 places, menu.lst, fstab & some resume file (will paste the link later its on the other OS!). Also I founf a command, vol_id that gives you the UUID of a partition. I have not tried this yet. Will edit this post once I try this out.
This may help those who has a multi boot system and has to reorganize partitions for adding / removing new OS.
I had heard about GUID is sort of disk signature which would have hanged and causing the issue. Searched net with GUID, but could not find any helpful links (later I realized that this is referred to UUID in linux/ubuntu parlance).
I tried to manually edit the partition number during the grub menu & boot. Now the problem became even more stranger! though I set the root as partition I wanted to boot, it was booting another OS! I was going crazy!!! I thought if I could only capture those messages that scroll on the screen while it boots and I found few links that make use of serial terminal:
http://www.techanswerguy.com/2007/09/capturing-boot-messages-in-linux-via.html
Since I was not having another comp & also I was on laptop without serial port, this is ruled out. now the only option for me was to verify my grub menu entry thoroughly and this time I found the silly mistake I was making:
title Linux Mint, kernel 2.6.22-14-generic (recovery mode) (on /dev/sda13)
root (hd0,12)
kernel /boot/vmlinuz-2.6.22-14-generic root=/dev/sda14 ro single
though I was changing the partition number in "root" part, I missed changing the partition number on "kernel" line. This was causing lot of trouble rendering most of my OSes un usable. But I still was having issues with ubuntu. This is because, ubuntu uses UUID and not the partition nubers (Probably this causd me to search for GUID earlier & miss the obvious partition number for mint OS). A search with UUID & Ubuntu revealed how to fix this. This needs updating the UUID at 3 places, menu.lst, fstab & some resume file (will paste the link later its on the other OS!). Also I founf a command, vol_id that gives you the UUID of a partition. I have not tried this yet. Will edit this post once I try this out.
This may help those who has a multi boot system and has to reorganize partitions for adding / removing new OS.
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