I have Ubuntu on an extended partition
I have the AMD-64 version of Ubuntu installed on the first logical partition that was created within the extended partiton on my first IDE hard drive. It works great. I have quite a few other logical partitions within the extended partion on each hard drive and have other versions of Linux on some partitions. On my second hard drive I have 3 more primary partitions and one extended partition which contains more logical partitions. I have a couple more linux distros on my second hard drive, one is on a primary partition and one is on an extended partition. I have Ubuntu, CentOS, Slamd64, Red Hat 9 and several versions of Slackware installed on various partitions. The swap partition can also be either a logical or a primary partition.
Some older computers from the 1990s had a limitation in their BIOS that for some reason required that Linux be booted from a portion of the hard disk that was below a certain cylinder number. That would most likely only be a problem if you have an older computer. On my AMD 64 computer and my older 266 MHz Petium II computer I have booted various versions of Linux from both Primary and Logical partitions on any portion of either hard drive on either computer. If I am not mistaken most or all versions of Windows or DOS need to boot from a primary partition on the first hard drive but Linux does not seem to care where you put it. The only restriction that I know of is that, if I am not mistaken, the second hard drive can't come after the CD-ROM.
I am not quite sure what you ment by the "DOS extended partition"? Is there more than one kind of extended partition? I am assuming there is only one kind of extended partition and that you mean "the extended partiton." After an extended partiton is created, one or more logical partitions need to be created within the extended partiton. There can not be more than a total of 4 primary and extended partitions per hard drive, but, many logical partitions can be created within the extended partition.
I have only used IDE hard drives not serial ATA or SCSI hard drive so my comments are for using one or two IDE hard drives.
Last edited by Rick485; 08-17-2005 at 10:45 PM.