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Old 05-06-2021, 12:08 PM   #17
OtinG
Old Gadget Guy
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Posts: 1,539
Karma: 2786381
Join Date: Jun 2018
Device: Oasis 3, iPhone XR, iPad mini 5, iPad Air 2020, Alexa Devices
Quote:
Originally Posted by ilovejedd View Post
Heat isn't really the issue (unless you've been stressing the drive for a long time). You need a good controller and parallelism to hit high speeds. Unfortunately, flash drives usually have neither. Heck, there are plenty of USB3 flash drives that are slower than USB2 HDDs (~40MB/s read/write). I have the same Samsung Fit flash drive. It's just not particularly fast, iirc.

Mind, even on SSDs, once you've run out of pseudo-SLC cache on modern SSDs, 256GB usually have significantly lower write speeds compared to, say, 1TB.

On Windows, I think USB3 tends to top out at ~300MB/s while UASP allows up to ~500MB/s.

I tested a freshly initialized Crucial MX500 2TB with, iirc, a Rosewill USB3-SATA adapter with UASP support. Used this USB-C hub to get USB-A ports.

https://www.amazon.com/uni-USB-Hub-6...dp/B07Q8TRVTN/

Test data is 13.06GB, 51 files. 4 are MP4 movies that are ~3+ GB each. The rest of the files are metadata and artwork (poster, backgrounds, etc).


2020 M1 MacBook Air 8GB/512GB

Crucial MX500 2TB
Read: 302.7 MB/s
Write: 315.3 MB/s


2020 iPad Pro 12.9 256GB

Crucial MX500 2TB
Read: 216.9 MB/s
Write: 166.3 MB/s

I'll add results for the 2017 iPad Pro 12.9 when I find the Lightning-USB3 Camera Adapter.
Thanks for the report! Those are very good speeds. The 2020 M1 MacBook Air has a Thunderbolt 3 (USB 4) port capable of up to 5000MB/s. The 2020 iPad Pro 12.9 has a USB 3.1 gen 2 port capable of 1250 MB/s. Both are impressive speeds.

The WRITE speeds with your 2020 iPad Pro 12.9 are twice as fast as those with my MacBook Pro and the SanDisk 250GB SSD, although the READ speeds are much slower. I got 428 MB/s READ and and 89 MB/s WRITE, but the same SSD on my iPad Air 2020 only had 112 MB/s READ and 17 MB/s WRITE so it got left in the dust on that test. But like you said, the larger capacity the SSD or flash drive, the higher the "up to" speeds claimed by the manufacturers. I assume that up to a certain point, the faster the USB port on a Mac or iPad will result in faster READ/WRITE speeds from the connected storage device as well. A faster port probably won't help much or any with an older USB 2 device, but hopefully it would help a bit with USB 3 drives.

I'm very impressed with your Crucial MX500 2TB. It obtains 3.5x faster WRITE speeds on your M1 Mac Air than my SanDisk 256GB SSD does on my MacBook Pro. At 89 MB/s, the SanDisk SSD is really a bit too slow for me to process Lightroom files directly off of it. I can do it, but it noticeably slows down the processing and gets rather laggy at times. But with 300 MB/s WRITE speeds I doubt it would be as noticeable, if at all. Unfortunately, the iPad Air 2020 with Lightroom app won't allow processing of externally stored files. The app or the iPad prevents this, either way it means I have to first move the files to the iPad then process them thereon before returning them to the external storage drive. But that Crucial MX500 2TB on my older MacBook Pro would likely allow me to process Lightroom files directly from it, and that in itself would save me a lot of time. Just copying 30 GB of RAW files to and from my SanDisk SSD takes several minutes.
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