File copy speeds with a 64GB SanDisk Ultra Luxe USB flash drive (SDCZ74-064G-I35)

I (recently) bought a USB flash drive after more than 10 years.
The last one I got was gratis, courtesy this forum

SanDisk Ultra Luxe USB 3.2 Gen 1 Flash Drive.
64GB, "Speeds upto 150 MB/s READ" (SDCZ74-064G-I35)

For UFDs, synthetic tests like Crystal DiskMark (and therefore most reviews) are meaningless.

I wanted to know what I could expect on *my* system.
Test System : USB 3.2 Gen 1 (rear port), source=SATA SSD, BX500.

I wanted to have a bootable UFD so I created one active FAT32 partition and one NTFS partition.
These tests were carried out with the NTFS partition.
These are file copy tests, I still can't figure out how to carry out a pure file read (or write) test.
UFDs are never used as boot drives, mostly used to hold/save data, so a file copy test is the most 'sensible'

Powershell script used. If anyone wants it (to, maybe, test a shiny new NVMe SSD ;-) let me know.

File copy speed varied from 22 MB/s to 58 MB/s.
Speed seem to depend on individual file size; and, if copying many files, the number of files.
e.g. the test reporting 22 MB/s had one large file of 3500+MB.
Pics attached.

rajch2002 said:

wow! that's mpt even half the advertised speed!

Click to expand...

SanDisk says "150 MB/s READ".

I was able to read files at 100+ MB/s.

Same tests with a 10 year old "SanDisk Extreme 64GB USB 3.0 Flash Drive With Speed Up To 245MB/s-SDCZ80-064G-GAM46"
(Read Up To 245MB/s; Write Up To 190MB/s)
Cost USD 35 in Sep 2014.
Having a large file, 3500+MB, did not impact file copy speed.











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Same tests but in reverse : UFD to SSD.
Should give some indication about the UFD read speed.