[Cialug] Help with Understanding Drives

[David Champion]

nvme is a type of ssd drive.

-dc


On Thu, Sep 27, 2018 at 3:19 PM Todd Walton <tdwalton at gmail.com> wrote:

> Hey all,
>
> I have a laptop with Ubuntu 16.04 on it that I know has one or more disks,
> one or more of which might be SSD, and that the root and/or home partitions
> are LUKS encrypted. I want to reinstall Linux on this laptop but I want to
> save the user data on it, so I'm trying to figure out how to shuffle all
> this around.
>
> Using fdisk tells me there are two drives, "sda" and "nvme0n1". An lsblk
> shows those two drives as well. I haven't seen "nvme" drives before, so I'm
> not familiar with how Linux handles them.
>
> Could the nvme drive be just the encrypted filesystem on top of the sda
> partitions? How do I tell if those two are truly two different physical
> disks or not? If the nvme is truly a separate physical disk, how could it
> be that whoever set up this laptop wouldn't have used it at all? (I don't
> see it being mapped to any filesystems.) The two have slightly different
> sizes, so maybe they really are two physical disks. I don't know what's up
> with all that "Microsoft" this-and-that. If it's a recovery drive that came
> built into the laptop surely it wouldn't be 238 freakin' gigs.
>
> ===================================
>
> @ ~> sudo fdisk -l
>
> Disk /dev/nvme0n1: 238.5 GiB, 256060514304 bytes, 500118192 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: gpt
> Disk identifier: F97E0C07-C73B-41D7-8CEC-57EDFB9C366C
>
> Device             Start       End   Sectors   Size Type
> /dev/nvme0n1p1      2048    534527    532480   260M EFI System
> /dev/nvme0n1p2    534528    567295     32768    16M Microsoft reserved
> /dev/nvme0n1p3    567296 498069503 497502208 237.2G Microsoft basic data
> /dev/nvme0n1p4 498069504 500117503   2048000  1000M Windows recovery
> environment
>
> Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: dos
> Disk identifier: 0x522a56e1
>
> Device     Boot   Start       End   Sectors   Size Id Type
> /dev/sda1  *       2048    999423    997376   487M 83 Linux
> /dev/sda2       1001470 468860927 467859458 223.1G  5 Extended
> /dev/sda5       1001472 468860927 467859456 223.1G 83 Linux
>
> Disk /dev/mapper/sda5_crypt: 223.1 GiB, 239541944320 bytes, 467855360
> sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
>
> Disk /dev/mapper/ubuntu--vg-root: 215.6 GiB, 231487832064 bytes, 452124672
> sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
>
> Disk /dev/mapper/ubuntu--vg-swap_1: 7.5 GiB, 8006926336 bytes, 15638528
> sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
>
> ===================================
>
> @ ~> lsblk
>
> NAME                    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
> sda                       8:0    0 232.9G  0 disk
> ├─sda5                    8:5    0 223.1G  0 part
> │ └─sda5_crypt          253:0    0 223.1G  0 crypt
> │   ├─ubuntu--vg-root   253:1    0 215.6G  0 lvm   /
> │   └─ubuntu--vg-swap_1 253:2    0   7.5G  0 lvm   [SWAP]
> └─sda1                    8:1    0   487M  0 part  /boot
> nvme0n1                 259:0    0 238.5G  0 disk
> ├─nvme0n1p3             259:7    0 237.2G  0 part
> ├─nvme0n1p1             259:5    0   260M  0 part
> ├─nvme0n1p4             259:8    0  1000M  0 part
> └─nvme0n1p2             259:6    0    16M  0 part
>
> ===================================
>
> Help?
>
> --
> Todd
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