Posts: 10
Joined: Sun Jul 07, 2019 6:11 pm

Speed Test Pi3b+ vs Pi4b4 : LAN + USB HDD

Sun Jul 14, 2019 8:51 pm

I have an old 2.5 inch Seagate 320GB SATA hard drive.
Since it is rated at 5V 0.451A I decided to test the Pi3B+ to see if it would boot without SD Card and without a powered hub but using a USB3 to SATA cable.
I was researching SSD drives and they all seem to be rated for higher Amps.
I downloaded the image and used Etcher to install it on the Seagate.
The Pi3b+ has a slow boot process (without SD card) but the installation worked perfectly.
After doing an apt update and upgrade I decided to try a 29GB file transfer over my gigabit network.
Here are the results for the same drive in both the Pi3b+ and the Pi4b4

Pi 3b+, boot off of usb 2.5" hard drive, copy to same drive
date; cp '/mnt/wdex2/Shared Videos/13_Hours.mkv' . ; date
Sun 14 Jul 2019 09:49:03 AM PDT
Sun 14 Jul 2019 10:13:11 AM PDT
29,574,419,171 bytes, Jul 14 10:13 13_Hours.mkv
163 mbps
temp=51.5'C at idle (no fan or heatsink or case)

Pi4b4, boot off sd card, copy to usb3/SATA 2.5" hard drive
date; cp '/mnt/wdex2/Shared Videos/13_Hours.mkv' . ; date
Sun 14 Jul 2019 12:53:39 PM PDT
Sun 14 Jul 2019 01:00:57 PM PDT
29,574,419,171 bytes Jul 14 13:00 13_Hours.mkv
540 mbps
temp=59.0'C at idle (no fan or heatsink, open top case)
3.3 times faster
Pi3b+ has USB2 and slower ethernet
Pi4b4 has USB3 and faster ethernet
Seagate320GB25HDcut.jpg (66.46 KiB) Viewed 280 times

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