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I have an HP TouchSmart^310 PC with Ubuntu 12.10 and Windows 7 on it. I know that every computer can have four primary partitions. This is what I get with sudo fdisk -l:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 testine, 63 settori/tracce, 121601 cilindri, totale 1953525168 settori
Unità = settori di 1 * 512 = 512 byte
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Identificativo disco: 0xe9bc6db9

Dispositivo Boot      Start         End      Blocks   Id  System
/dev/sda1            2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2   *      206848  1518526463   759159808    7  HPFS/NTFS/exFAT
/dev/sda3      1518528510  1910609919   196040705    5  Esteso
/dev/sda4      1910609920  1953521663    21455872    7  HPFS/NTFS/exFAT
/dev/sda5      1518528512  1902747647   192109568   83  Linux
/dev/sda6      1902749696  1910609919     3930112   82  Linux swap / Solaris

/dev/sda2 is Windows 7 with label OS, /dev/sda4 is Ubuntu with no label and /dev/sda4 is the HP RECOVERY ENVIRONMENT. But I can't figure what is /dev/sda1: every time I boot my PC, in GRUB I can see:

  • Ubuntu
  • Ubuntu with advanced settings
  • Windows 7
  • Windows 8 (???)
  • HP Recovery Environment

I don't know if Windows needs /dev/sda1 for booting, or is the partition I left there when I installed the Windows 8 Consumer Preview. I'm asking this because I need to create another partition, neither I want to convert to GPT. Can I remove /dev/sda1?

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migrated from Nov 1 '12 at 17:42

This question came from our site for users of Linux, FreeBSD and other Un*x-like operating systems.

Your question is really about Windows, it's off-topic here. As far as Ubuntu is concerned, you can remove /dev/sda1, but it may destroy your Windows installation, we wouldn't know. I've flagged it for migration to Super User. Please do not repost unless your question gets closed here. – Gilles Nov 1 '12 at 17:26
Small typo - Ubuntu and HP Recovery aren't sharing /dev/sda4. – Karan Nov 1 '12 at 17:54

/dev/sda1 is most likely Windows 7's system partition and Windows 7 won't boot without it.

It's unlikely that it's a leftover from the Windows 8 Consumer Preview, since Windows 8 increased the size of the system partiton from 100 MiB to 350 MiB (source).

Although it's true that you can't create more than four primary partitions, you can create additional logical partitions (/dev/sda7, etc.) inside your extended partition (/dev/sda3). For most purposes, it makes no difference if you use a primary or a logical partition.

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I once had my computer quad-booting (XP, Vista, 7 RC, Linux) on one disk. With an extended partition, doing such a thing is quite easy. – Ben Richards Nov 1 '12 at 18:05
sorry, I didn't understand: can you explain me what the second thing you've said (increasing p. size from 100mib to 350mib) can influence my partitioning? – shoyip Nov 2 '12 at 19:18
You said I don't know if Windows needs /dev/sda1 for booting, or is the partition I left there when I installed the Windows 8 Consumer Preview. Since Windows 7's system partition is 100 MiB big and Windows 8's is 350 MiB, your system partition belongs to Windows 7, not 8. – Dennis Nov 2 '12 at 21:51

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