I'm trying to set up NAS server using RasPi 4, Open media vault, 1 TB SSD hardisk(WD). The challenge I'm experiencing is slow data copy rate[3-4 MB/sec] while copying the files from my laptop[Connected to wifi] to RasPI connected to LAN cable.

Tried fixing with usb-storage.quirks [https://www.raspberrypi.org/forums/viewtopic.php?t=245931], but it still didn't fix my issue.

SSD uses EXT4 file system.

Looking for your help, to address this issue.

2 Answers 2


I bet the bottleneck is you WiFi speed. Unless you have 5GHz WiFi, 3-4 MB/s is a completely reasonable speed for a 54Mbps connection, after you factor in eventual packet loss and protocol overhead.

If you plan to switch to 5GHz WiFi (or already have it), you may want to check this question to know what data rates you can expect. It won't be exactly your case (Pi connected with Ethernet cable), but whatever is written about the built-in adapter of the Pi applies to laptop WiFi adapters too, to some extent.

Running sudo hdparm -Tt /dev/sda should give you a first estimation of how fast your disk is.

  • Currently, Pi connected to a 5GHz wifi, stil getting the same speed. pi@raspberrypi:~ $ sudo hdparm -Tt /dev/sda1 /dev/sda1: Timing cached reads: 1542 MB in 2.00 seconds = 771.60 MB/sec Timing buffered disk reads: 350 MB in 3.01 seconds = 116.45 MB/sec
    – Paramesh
    Mar 19, 2021 at 17:24
  • @Paramesh Try running top during a file transfer: it could be that your server is doing it inefficiently and the transfer is CPU-bound. Mar 30, 2021 at 6:36

For the lowest common denominator, you say you are copying data from a wireless connection to a NAS wired up to the LAN. In this case, the bottleneck is likely in your Wireless upload speed. If you connect the laptop to the LAN with a wire, does the copy speed increase?

Some more information on your hardware would help to determine what the problems are ie. Wireless card/driver in the laptop, switch model, RAID configuration of the NAS.

There are probably other factors to consider that I am too smooth brained to talk about in any real way, but that would be my first step in troubleshooting this.

  • That's correct, I'm facing slow transfer between laptop and Raspberry pi - NAS server. Hardware details:
    – Paramesh
    Mar 19, 2021 at 3:30
  • That's correct, I'm facing slow transfer between laptop and Raspberry pi - NAS server. Hardware details: Raspberry PI 4 -> 4 GB RAM Western Digital Ultra 1 TB HD 1 Gigabit LAN Macbook pro [laptop] I havent' figured the RAID. Followed this blog setup NAS server [pimylifeup.com/raspberry-pi-openmediavault/….
    – Paramesh
    Mar 19, 2021 at 4:57

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