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Old 02-21-2008, 01:35 PM   #1
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Disk Partitions

Do extended / Logical partitions offer the same protection as Primary partitions?

Meaning.... are logical partitions safe from data being written over to the next logical partition even though they all are within a primary partition?
Old 02-21-2008, 02:24 PM   #2
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disk partiotions

Put it this way if you divide you,re drive in different partitions
you can create in each partition logical drives
For the programs each logical drive is totally separate drive

good luck
Old 02-21-2008, 03:26 PM   #3
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The primary/logical difference is primarily in the data structures used on disk to store the information about the partitions. The behavior of the partitions in Linux doesn't depend on that: Linux won't let you overwrite sda6 by an incorrect operation on sda5.

But Linux will allow you to destroy any of the partitions by an incorrect operation on sda (assuming you are root or have some other way gotten write access to sda). I'm not certain, but I think the same applies to sda4, assuming sda4 is an extended partition containing logical partitions sda5 and sda6, I think root could trash sda6 by trashing sda6 directly or by trashing sda4 or by trashing sda, but couldn't do it by trashing sda5. So sda2 has a bit more protection in that root can only trash it two ways instead of three (but I could be wrong about how sda4 works).
Old 02-21-2008, 03:35 PM   #4
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Angry Improper use of maintenance commands can trash anything easily

Root can do anything, including execute proper syntax, but that are improperly issued commands. Linux lacks an `Edit / Undo' as administrators know better than to fdisk /dev/sda4
Not sure what Safe / protection you are referring to irt to differences btwn Primary & Logical
Old 02-21-2008, 03:38 PM   #5
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If you use low-level tools like dd, you can trash things with equal ease--no matter what kind of partitions you have. Once you are inside of a primary or logical partition, there is no difference in how things work. (Most tools, utilities, etc. would not even know what kind of partition they were operating in.)

As I understand it, Windows has a problem being in a logical partition, but that's only associated with the partition tables (ie the routing TO the partition).

Note that partition tables which include extended/logical partitions act as "linked lists"--specifically, an "extended partition" does not define space on the drive--it is only link to a partition table where the first logical partition is defined. The fact that an extended has a size is--I assume--only to tell partition managers how much space is being set aside for logicals.

I've never tried writing data to an extended partition. ( I would not attempt this on any machine being used for any real work....



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