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["Rachael Bond" <rlb@xxxxxx>]

-----Original Message-----
From: "Rachael Bond" <rlb@xxxxxx>
Date: Wed, 17 Mar 2010 19:26:34 
To: Bug 521045<521045@xxxxxxxxxxxxxxxxxx>
Subject: Re: [Ubuntu-manual] [Bug 521045] Re: partitioning using mb boundaries

How complicated an answer do you want to this question?

The default Linux geometry is 255 heads with 63 sectors per track.

Windows 7 uses a geometry of 240 heads with 63 sectors per track to accommodate solid state drives.

According to Ted Tso the ideal geometry (which I use) is 224 heads with 56 sectors per track since for a solid state drive to work efficiently the partitions need to be aligned on 128k boundaries.

It should also be noted that the start of the first partition (or the start of data within it) should be offset to 1024k to take account mis-allignment due to the MBR.

This is all vital for correct functioning of solid state drives :)

Please also note my launchpad bug #415888. Using ext4 for installation on a solid state drive will cause the install to fail or not work correctly if the drive has an indilinx controller (most do). I think this is because indilinx is not 100% sata compliant. So its best in these circumstances to install using ext3.

Rachael
-----Original Message-----
From: Ralph Ulrich <eulenreich@xxxxxx>
Date: Wed, 17 Mar 2010 18:39:00 
To: <ubuntu-manual@xxxxxxxxxxxxxxxxxxx>
Subject: [Ubuntu-manual] [Bug 521045] Re: partitioning using mb boundaries

A new idea for partitioning a new disk Megebyte aligned.
Using a different CHS config to get MiB alignments:

Now it is 
1 cylinder = 255 heads * 63 sectors * 512 bytes

If you change fdisk config to
1 cylinder = 32 head * 64 sectors * 512 bytes
this should align a partition for parallel us with Win7 ?

I don't trust my idea for I don't know if something can go wrong 
using different CHS values...
What is CHS good for, we are using LBA anyway. Is CHS just a software calculation with no hardware implications?

-- 
partitioning using mb boundaries
https://bugs.launchpad.net/bugs/521045
You received this bug notification because you are a member of Ubuntu
Manual Team, which is subscribed to Ubuntu Manual.

Status in Gnome Partition Editor: New
Status in Ubuntu Manual: Invalid
Status in “parted” package in Ubuntu: New
Status in “partman-auto” package in Ubuntu: New
Status in “parted” package in Debian: Unknown

Bug description:
Binary package hint: partman-auto

I would like to give people a try using ubuntu 
but I fear to setup some trouble for them if they use win7.
This isssue is described here:
https://answers.launchpad.net/ubuntu/+source/gparted/+question/99298
It is a MS related partitioning bug.

To get around there are 3 ways possible:

C) Most easily: You typically purchased a notebook where there are 3 primary partitions. Ubuntu Release Notes should mention that in case of dual boot  you should only create one primary root partition not any more ! (no swap, no home, no further extended)

B) A more sophisticated approach: Since Vista Windows needs a megabyte free space just in front of every first primary partition and a megabyte free space in front of every first logical partition in every extended partition. Partition your disk accordingly or give Windows7 Partitioniong Tool a try to configure your harddisk appropriet for a linux install (more easy?)

C) Feature request: make linux partitioning tools feature a windows7 compatible mode.



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