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Questions tagged [fdisk]

fdisk (for "fixed disk") is a command-line utility that provides disk partitioning functions.

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6
votes
1answer
3k views

How to properly align partitions?

I'm trying to understand what are the rules for creating correctly aligned partitions. For the moment I'm playing with parted on a virtual machine, but I'm planning to move to a real hard disk when I ...
4
votes
2answers
6k views

I ran fdisk on a wrong drive. How can I recover

I ran fdisk on the wrong HD. I basically cleared partition table, pressed w and quited fdisk and only then realized that that was my main harddrive... I got this message: WARNING: Re-reading ...
4
votes
2answers
10k views

What are the ramifications of not having a valid partition table?

I recently upgraded my Ubuntu from 11.10 (Oneiric) to 12.04 (Precise Pangolin) on a Dell Inspiron B130 Laptop. When I run fdisk -l it says that my HD doesn't contain a valid partition table. I have ...
2
votes
1answer
821 views

Do I need to format a CF before installing Linux?

I recently purchased an 8GB Patriot CF card, like this one . I also have a Syba CF/Sata adapter. I put these together into my mini-itx computer (connected via Sata cables, not USB) and booted an ...
1
vote
2answers
1k views

Fdisk partition alignment, NAND, not showing specified heads

I ran fdisk with these options, fdisk -H 32 -S 32 /dev/sdc Then I made a new label, and created an aligned first partition. Disk /dev/sdc: 7743 MB, 7743995904 bytes 32 heads, 32 sectors/track, ...
3
votes
1answer
127 views

HDD Testing En Masse

Does anyone have any ideas about how to set up automatic detection and conditional formatting of a LOT of HDDs? I tried posting this on TomsHardwareForums, but I don't think the responder read my ...
1
vote
2answers
2k views

fdisk hangs on “Syncing disk” when resizing a raw QEMU image

I'm using fdisk to resize the partitions on a raw QEMU image. When I write the new partition table, it hangs at "Syncing disks." Note that I'm running fdisk as non-root since I don't need root to ...
1
vote
1answer
2k views

Adding a populated existing disk device to a QEMU raw image

I have a raw QEMU image (vda.raw), and I would like to resize it and add an existing partition, using data I have in a file that contains a raw ext3 file system populated with data (vdb.raw). The two ...
6
votes
3answers
1k views

how to use “Unusable” sectors outside defined partition boundaries

What might be a convenient way to stash some hidden data in the "Unusable" area following the last partition, or anywhere outside defined partition boundaries? For example, making it appear as a /dev/...
2
votes
0answers
2k views

WD MyBook 3TB - Gparted failed & HDD partitions recovery?

I have this new WD MyBook external HDD (USB 3.0/2.0); I created 3 partitions, all of them ext3 type (~1 TB | ~1 TB | ~750 GB) I loaded lots of files all the partitions were like ~30% full on each, ...
19
votes
6answers
51k views

Change the number of the partition from sda1 to sda2

I have a disk with two partitions: sda1 and sda2. I would like change the number of sda1 to sda2 and sda2 to sda1. It's possible but I don't remember the procedure. i.e. My first partition will be ...
11
votes
3answers
4k views

Why do we need to specify partition type in fdisk and later again in mkfs?

I'm a little confused about fdisk and mkfs. So - here is typical USB flash drive partitioning and formatting: umount /dev/sdb fdisk fdisk /dev/sdb Command (m for help): d Selected partition 1 ...
2
votes
2answers
5k views

Use testdisk and gpart information to mount ext4 partition

I am trying to recover the ext4 partition table of a 2TB disk, where I have 900.000 files. I have cloned the original HD and now I am working on the cloned HD. And I am running Parted Magic Live CD. ...
6
votes
3answers
34k views

How do I check how much free space left on a device to create a partition

Let's say I have this virtual machine running: [root@centos ~]# fdisk -ul Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors Units = sectors ...
5
votes
4answers
1k views

Can't access USB HDD

I just bought a WD 1TB Caviar Blue drive, and a Bytecc HD-35SU enclosure for it. Snapped the drive in, went to plug it in on my laptop, nothing happened. I figured that probably meant I needed to ...
2
votes
2answers
1k views

Errors from cfdisk with new external USB backup drive

I've picked up an HP SimpleSave sd500a backup drive. This is a 2.5", 500GB drive. It has a mysterious CD-like partition, but otherwise seems to contain a WD Scorpio Blue disk. It seems that the CD-...
3
votes
2answers
5k views

How to create a new partition on a hard disk?

How do I create a new partition on a hard disk, from the terminal? I've been reading the man pages for fdisk and mkfs, but they're confusing. I need to know how to create a new partition on a blank ...
12
votes
1answer
9k views

How does partprobe work?

I was looking for a way to refresh the scsi bus (or any other bus, for that matter) that would allow my kernel ( 2.6.18-194-el5 on CentOS 5.5) to know about the partitions on a drive, and I couldn't ...
2
votes
1answer
2k views

fdisk unable to open

I am having problems using fdisk to clear the partition table of my sd card. The sd card is identified in the /dev folder when inserted into the sd card reader, but when the following command in run: ...
24
votes
4answers
55k views

Finding the sector size of a partition

I answered this question, assuming that the *.img file had a sector size of 512. How do I query a device, or the image of a device, to find the correct sector size?