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Asked: 2026-05-30T06:33:28+00:00

I want to write a C++ function that can give me a list of

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I want to write a C++ function that can give me a list of hard drives in a machine (running Linux), but I want to filter out any USB flash drives.

When I read /proc/partitions I find sda and sdb, but I think that is not enough to differentiate between the primary hard drive and the USB flash drive. Is there a way to do this?

Thanks!

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1 Answer

  1. Editorial Team

    You could use the symlinks in:

    /sys/block

    For example, I have:

    $ ll
 ...
 sdb -> ../devices/pci0000:00/0000:00:0e.0/host1/target1:0:0/1:0:0:0/block/sdb
 sde -> ../devices/pci0000:00/0000:00:0e.2/host5/target5:0:0/5:0:0:0/block/sde
 sdf -> ../devices/pci0000:00/0000:00:0b.1/usb1/1-8/1-8:1.0/host8/target8:0:...
 sr0 -> ../devices/pci0000:00/0000:00:0d.0/host6/target6:0:0/6:0:0:0/block/sr0
 sr1 -> ../devices/pci0000:00/0000:00:0d.0/host6/target6:0:1/6:0:1:0/block/sr1

    You can spot the USB device in there pretty easily.

    Look at the directories pointed to by those symlinks, there’s a bunch of useful information there as well.

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