Dual Booting All discussion on Dual Booting 2 operating systems (or even more!) on the Dell Mini

Thread Tools Display Modes
  (#11) Old
reflex reflex is offline
reflex's Avatar
Posts: 1,997
Join Date: Apr 2009
Default 09-25-2009, 01:05 PM

Originally Posted by OmgFriday View Post
Reflex, I got a 160GB HD, I am going to follow your guide to backup it onto an external USB drive. My questions to you are,
1. Is gzip capable to handle such a big file?
2. What is the typical compression ratio I can get out of gzip?
Thanks in advance.
1. I haven't tried gzip on such a large file, but I expect it'll work. gzip won't display the compression ratio or uncompressed size correctly for such a large file (>4GiB), but the data should be fine.

2. Compression ratio depends on input. For a drive image, if the empty space is zeroed out, than the compressed image should be equal or less than the size of the used space.

For example, if you have a 160GB drive with two 80GB partitions, one with 30GB used and one with 10GB, I'd plan for the final image file to be 40GB. In practice, the image will probably be smaller, but it's best to plan for the worst.

And as a real-world example, I've imaged two Mini 9's. The Ubuntu 4GB image compressed down to 1.3G and the 8GB WinXP image compressed down to 2.2GB. The compression ratio should be better on a larger, emptier drive.

Mini 9 | Intel 5100 Wifi | Ubuntu 10.04 Netbook
Mini 1012 | SSD | Intel 6200 Wifi | Ubuntu 11.10 64bit
Reply With Quote
  (#12) Old
OmgFriday OmgFriday is offline
Posts: 87
Join Date: Sep 2009
Default 09-28-2009, 12:10 AM

Update: I did an image creation with dd. It took,
- about 5H to write the entire 160GB over to an external USB2.0 drive.
- about another 3H to gzip the image downto 5.1GB in a separate process.

It will be the way for my next backup.

Hat off to Reflex.

Mini10v| 2GRAM| 160GB| BT(Added)| A05| QuadBoot(SnowLeopard10.6.2,WinXP.SP3,Ubuntu.Deskto p9.10,Moblin2.1)|
USB wake OFF, L support ON| NBI 8.2 -> NBI 083RC3 -> NBI 083RC4-> NBI 083Final
Reply With Quote

« XP and SL dual boot on 10v with Leopard Mini, XP machine and 16gb USB | Newbie Question.... »
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Copyright © 2008-2016 MyDellMini.com.