Written 2 Sep 2026. This is a how-to, not a product card. Buy links are not tagged yet.

Peek at leftover-box partitions via /proc/partitions

After a parted -l layout printout, /proc/partitions is a look-only kernel list of names and sizes. Nothing is created, wiped, or mounted.

/proc/partitions is a text file the Linux kernel keeps in memory. It lists whole disks and slices the kernel already knows about. Tonight you only read that list on the leftover box. You do not format, wipe, or attach a folder.

Skip until SSH works

If you cannot log in from the couch yet, stop. That is SSH from the couch. A kernel partition list does not help a login that fails.

If you only need the friendly disk tree, that is see disks and USB sticks on the leftover box (lsblk). If you only need which folders are already attached, that is see which leftover-box folders are already attached (findmnt).

What this is

/proc is a special folder of live kernel facts. Files there are not ordinary documents on the disk. They are snapshots the kernel builds when you open them.

parted -l and fdisk -l print layout tools' views, often with table type and filesystem hints. /proc/partitions is the kernel's shorter list. It shows major and minor numbers, size in 1K blocks, and a short name like sda or sda1. Same leftover box, third look-only angle. Still no write, format, or wipe.

Practice: read the kernel list (look only)

SSH into the leftover box from the couch.

Then print the file:

cat /proc/partitions

The leftover box should show a short header, then lines with columns. Columns are often major, minor, blocks, and name. Whole disks and slices both appear. The kernel is telling you which block devices it already knows. It is not inviting you to rebuild them.

Optional: page through a long list:

less /proc/partitions

Press q to leave less.

Home-safe look only on the leftover box. Do not pipe this into a wipe tool. Do not run wipefs, dd, format, mount, or umount as tonight's job.

Optional: compare names with the friendly tree you already practiced:

lsblk

Names should line up with what you saw in /proc/partitions. If a USB stick is missing from both, reseat the stick. Then check see if the USB backup disk showed up. Still no format tonight.

Optional: after you plug in a USB for backup

Plug the stick into the leftover box.

Run lsblk.

Then run cat /proc/partitions again.

You should see a new short name for the stick. It is often sdb or sdb1, or similar. Compare with parted -l if you want a layout-style map. The backup job, once a path is live, is a backup of the leftover-box folder.

Useful extras, still a look

Skip editing anything under /proc. These files are read-only views. They are not a place to save a new partition map.

Skip wipefs, smartctl, interactive parted, fdisk without -l, mount, umount, dd, shred, format, and rewriting fstab. Those are not this note.

Skip buying a NAS because a leftover box number looks unfamiliar. Free room is see if the leftover box still has room.

Skip screen, tmux, and port 22 forwarding. Keep SSH on the house network: keep the leftover box on the house network.

What this is not

This is not a parted -l layout printout. That is peek at leftover-box partition layout with parted. It is not the classic fdisk -l table. That is peek at leftover-box partition tables with fdisk. It is not the friendly disk tree. That is see disks and USB sticks on the leftover box.

What next

Need parted's layout first? Peek at leftover-box partition layout with parted. Need room left on a path? See if the leftover box still has room.

Skip

Skip if SSH still fails. Finish SSH from the couch first.
Skip parted -l, fdisk -l, lsblk, or findmnt as tonight's job if you only came for this look-only peek. Those notes already exist.
Skip writing under /proc. Read only.
Skip wipefs, smartctl, mount, umount, dd, shred, format, and rewriting fstab.
Skip buying a NAS because a blocks column looks unfamiliar.
Skip opening SSH to the internet. That is keep the leftover box on the house network. Do not forward port 22.

Sources

Debian: proc(5) (see partitions). Linux kernel docs: The /proc Filesystem. Official pages only. For parted’s layout printout, see peek at leftover-box partition layout with parted. For the classic fdisk table, see peek at leftover-box partition tables with fdisk. For udev properties, see peek at leftover-box disk details with udevadm. For printed labels and UUIDs, see read leftover-box disk labels and UUIDs. For the disk-name list, see see disks and USB sticks on the leftover box. For the mount map, see see which leftover-box folders are already attached. For free room, see see if the leftover box still has room. For a second copy once a USB path is live, see a backup of the leftover-box folder. For the login, see SSH from the couch.

Also on this topic

SSH from the couchType commands on the leftover box from your laptop, on the house network. Password login first. Do not open this to the internet. Peek at leftover-box partition layout with partedAfter fdisk -l shows the partition table, use parted -l (look-only) so you see a second layout printout — sizes and filesystem hints — without creating, resizing, or rewriting anything. Peek at leftover-box partition tables with fdiskAfter udevadm shows disk properties, use fdisk -l (look-only) so you see the partition table layout — sizes and slice names — without creating, deleting, or rewriting anything. See disks and USB sticks on the leftover boxAfter SSH works (and before you blame a missing USB backup), list disks and USB sticks with lsblk so you see names like sda and sdb without opening a disk app. See which leftover-box folders are already attachedAfter you can list disks with lsblk (and before you blame a missing USB backup), use findmnt to see which folders are already attached (mounted) so you know what is live as / or a USB path. Read leftover-box disk labels and UUIDsAfter you can list disks with lsblk and see which folders are attached with findmnt, use blkid to read labels, UUIDs, and filesystem types on disk slices so you can tell which stick or slice is which. Peek at leftover-box disk details with udevadmAfter by-id shows hardware-style fixed names, use udevadm info (look-only) on a disk path so you see the properties udev already knows — without mounting or rewriting anything. See if the leftover box still has roomAfter the house folder is working, check that the leftover box is not filling up. Photos stop copying when the disk is full. You do not need a NAS for this look. See how big the leftover box disk already isBefore you buy a tiny computer or a NAS, check how big the leftover box disk already is. See if the USB backup disk showed upBefore you trust the weekly copy, confirm the leftover box can see the USB disk. A backup of the leftover-box folderA second copy of the house folder, on a USB disk you already have, or on another leftover computer. You do not need a NAS for this. Keep the leftover box on the house networkSSH and Pi-hole belong on the house network. Skip this if you never opened the router settings. Do not forward port 22.