Help - understanding Dell Studio 1537 partitions ?

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http://forums.opensuse.org – This is not strictly a Linux question, although I am interested in any Linux cautions as to what to avoid that could impact my Linux on the computer in question. I have Linux (openSUSE-11.1) setup on dual boot with MS-Vista on a Dell Studio 1537 laptop. My wife is "fed up" with Vista, and has asked that I replace Vista with WinXP on this Laptop. I would like to do this over the Christmas holiday break. The laptop's 1 year support warrantee has expired. Please, can someone explain to me the function of the two Dell /dev/sda1 and /dev/sda2 partitions ? This laptop was purchased with MS Vista installed, with 3 primary partitions (small /dev/sda1 (called "Dell Utility" ),10GB /dev/sda2 (unknown - appears to be some sort of Dell backup/recovery partition ? ), /dev/sda3 (MS Vista which had the remainder of the 250GB drive, although I have subsequently reduced this to 69GB ). Again, I note /dev/sda3 is the 69GB MS Vista partition (I reduced it to 69GB when I installed Linux (openSUSE-11.1)). I also believe it may be in /dev/sda3 where I should plan on installing winXP. Currently I have openSUSE-11.1 Linux in /dev/sda4 (divided into extended partitions, with /dev/sda5 (swap), /dev/sda6 (root), and /dev/sda7 (/home) for Linux and it works well. I plan to keep openSUSE-11.1 Linux when Vista is replaced by WinXP Can I remove and merge /dev/sda1, /dev/sda2, and /dev/sda3 and replace them with one partition for WinXP ? Or am I better OFF keeping /sdev/sda1 (Dell Utility) ? and am I better off to keep /dev/sda2 (some sort of Vista ?? recovery) ? and only put winXP on /dev/sda3 ? Aside from the MBR with Grub being destroyed (when I replace Vista with winXP) is there anything else I need to be careful of wrt keeping my openSUSE-11.1 Linux install on this laptop ? I've also sent a slightly different version of this post as a question to the Dell Support mailing list. p.s. for information, here is some output from Linux commands showing the contents: Output of: df -Th Code: Filesystem    Type    Size  Used Avail Use% Mounted on /dev/sda6    ext3    20G  7.9G  11G  43% / udev        tmpfs    2.0G  260K  2.0G  1% /dev /dev/sda7    ext3    131G  61G  63G  50% /home /dev/sda2  fuseblk    10G  5.1G  5.0G  51% /windows/D /dev/sda3  fuseblk    69G  39G  31G  56% /windows/C Output of: fdisk -l Code: Disk /dev/sda: 250.0 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x08000000   Device Boot      Start        End      Blocks  Id  System /dev/sda1              1          18      144553+  de  Dell Utility /dev/sda2              19        1324    10485760    7  HPFS/NTFS /dev/sda3            1325      10247    71673997+  7  HPFS/NTFS /dev/sda4  *      10248      30401  161887005    f  W95 Ext'd (LBA) /dev/sda5          10248      10509    2104483+  82  Linux swap / Solaris /dev/sda6          10510      13120    20972826  83  Linux /dev/sda7          13121      30401  138809601  83  Linux (Distributions)