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12
votes
2answers
4k views

Will dd if=/dev/zero of=/dev/sda wipe out a pre-existing partition table?

Will # dd if=/dev/zero of=/dev/sda wipe out a pre-existing partition table? Or is it the other way around, i.e, does # fdisk /dev/sda g (for GPT) wipe out the zeros written by /dev/zero?
1
vote
0answers
390 views

Problem mounting and reading hard disk

I am trying to read the content of a 1Tb external disk. The device was part of an external nas (dlink 320) using raid 1. when I plug the hard disk using the usb port no partition is mounted. The ...
1
vote
1answer
432 views

linux gdisk (on 4TB USB drive) followed my mkfs — but mkfs doesn't see new partitions

I just bought two new 4TB external USB disks for backups http://www.bestbuy.com/site/wd-my-passport-4tb-external-usb-3-0-portable-hard-drive-black/5605533.p that came performatted with a single ...
2
votes
0answers
7k views

Backup GPT table is corrupt. Fix will disappear at reboot

My recently installed ubuntu 16.04 system is not behaving correctly (does not boot). I did check the status of the hard drives using fdisk and I discovered that somehow the backup GPT table is corrupt....
4
votes
1answer
2k views

Can't restore/reformat my USB flash drive after moving to GPT

I have 8GB flash memory stick. Sometimes ago I formatted it to be able to install Windows from it. I can't remember what exactly I did but I think I wanted to be able to install Win 7 64-bit to boot ...
5
votes
2answers
9k views

Transforming a disk from MBR to GPT

I have a disk with classic MBR and want to transform it to use GPT without data loss. I have seen several more or less useful tutorials, but most of them are dealing with the specific problems related ...
2
votes
1answer
4k views

Understanding syslinux and partitioning

I am trying to learn and especially understand how partitionning and boot-loaders work. The problem is that I got it all twisted in my mind. In the end I don't understand anything anymore. I know ...
8
votes
3answers
21k views

Getting the extra GPT info; a “fdisk -l” equivalent

What is the equivalent for GPT using HDDs of: # fdisk -l /dev/hda > /mnt/sda1/hda_fdisk.info I got this from https://wiki.archlinux.org/index.php/disk_cloning (under "Create disk image") for ...
11
votes
4answers
54k views

Problem mounting GPT disk partition

I am trying to mount a partition on a GPT disk, but I get the following error: $ sudo mount -t ext4 /dev/sda1 disk/ mount: special device /dev/sda1 does not exist Looking at dmesg, I don't see any ...
2
votes
3answers
2k views

What's the difference between fdisk -l and df -h?

In my ubuntu system, I want to have a look about my system disk info. When I use fdisk -l without sudo, I get nothing. But with sudo fdisk -l, I only get a device /dev/sda1, but when I use df -h, I ...