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General discussion • Re: Saving large files to SSD

save it to an attached SSD or USB
Save it in the video camera or where?

200 GB is big. Lots of USB and SSD devices will record a few GB then sloowww ddddoooowwwnnnnnnnnnnnnn. Recording can be slow. When you copy to somewhere else, the copy can slow down after a few GB.

Ethernet is about 1 Gbps which is about 100 GBps. I tested many SSD and USB sticks. They can mostly run faster than Ethernet for a few seconds. The good ones run faster than Ethernet for a few minutes, say 10 GB, then slow down.

The microSD card interface in Pi 4 and 5 runs about 50 MBps. Actual cards run far slower. Expect slow copies if the card is involved.

The USB 3 interface in the Pi 4 shares the 5 Gbps, about 500 MBps, interface across both USB 3 ports. The Pi 5 has separate bandwidth for bot USB 3 ports. If your download is from a USB 3 SSD to a USB 3 SSD, it can run up to twice as fast on a Pi 5.

The Pi 5 also has a PCIe connection for an NVMe SSD. I am running mine at PCIe 3 speed. The results are insanely fast compared to everything else. If you are writing large files to a Pi frequently, go for a top model NVMe SSD in a Pi 5 using a PCIe adaptor.

Internet speeds are not as impressive. In our area, all the networks good at times and slow down when 3 billion school kids arrive home to play games.

Ext4 or NTFS or ExFAT. There is a difference in speed for copying 35,000 tiny files but not much for one big file. You hit the hardware write speed after a few GB.

Statistics: Posted by peterlite — Thu Jun 27, 2024 9:49 am



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