Crucial MX500 & TRIM

Hexley

macrumors 65816
Original poster
Jun 10, 2009
1,014
100
macOS: 10.13.14
Model: Late 2011 13" Macbook Pro Core i7 8GB 1600Mhz DDR3
SSD: 1TB 2.5" Crucial MX500
Format: APFS
Used Space: Less than 0.5TB
Blackmagic Read: 507MB/s
Blackmagic Writes: 450MB/s
Turn on to login while 100% charged and plugged: Less than 16 seconds

Hi! I did a fresh install of HS and noticed that TRIM Support is "No".

Should I turn TRIM Support to "Yes"?

On an unrelated note I noticed really weird read/write speeds via USB 2.0.

Copying from 4 different IDE drives housed inside a Firewire 400 (400Mbs/s) enclosure one after another onto the Mac I got write writes of >40MB/s. As expected.

Copying to a 20TB WD My Book Duo RAID0's USB 3.0 (5Gb/s) from my Mac's USB 2.0 (480Mb/s) got me read/writes of 15-25MB/s. That is surprising as I was expecting ~48MB/s from reading from a SSD to writing to a RAID0.

It took me 8-9 hours to copy over 404.4GB of data instead of 2.4 hours. :-|
 
Last edited:

FNH15

macrumors 6502
Apr 19, 2011
332
239
In macOS, TRIM support for non-Apple SSDs is turned off by default. If your SSD supports TRIM (like yours does,) then you should turn it on.

As for USB 2.0 speeds, I'm afraid I won't be much help to you there, as its been quite some time since I interfaced with any USB 2.0 media.

Hope that helps!
 
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Darmok N Jalad

macrumors 68030
Sep 26, 2017
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Yes, absolutely enable TRIM. You'll see better long term performance.

As for the USB 2.0 question. Found this on wikipedia:
USB 2.0 was released in April 2000, adding a higher maximum signaling rate of 480 Mbit/s (High Speed or High Bandwidth), in addition to the USB 1.x Full Speed signaling rate of 12 Mbit/s. Due to bus access constraints, the effective throughput of the High Speed signaling rate is limited to 280 Mbit/s or 35 MB/s.
I suspect that since your device is designed for USB 3.0, it might struggle to communicate over the older, slower USB 2.0 bus.
 

Hexley

macrumors 65816
Original poster
Jun 10, 2009
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Yes, absolutely enable TRIM. You'll see better long term performance.

As for the USB 2.0 question. Found this on wikipedia:


I suspect that since your device is designed for USB 3.0, it might struggle to communicate over the older, slower USB 2.0 bus.
I've observed in my 2010 13" Macbook Pro that USB 2.0 was able to be sustained at ~48MB/s

So no issues with HS, APFS & TRIM?
 

Darmok N Jalad

macrumors 68030
Sep 26, 2017
2,641
10,727
Tanagra (not really)
I've observed in my 2010 13" Macbook Pro that USB 2.0 was able to be sustained at ~48MB/s

So no issues with HS, APFS & TRIM?
I wouldn’t even use APFS, to be honest. Apple has yet to really sell me on the benefits over HFS+, especially on non-Apple SSDs. You can bypass the APFS conversion while installing HS.
 

h9826790

macrumors G5
Apr 3, 2014
14,263
6,861
Hong Kong
You should turn ON TRIM. It's not just performance issue, but without TRIM, the SSD will ware out much quicker due much more unnecessary internal data movement (when the SSD onboard controller doing some internal "house keeping").

For your info, my MX500 2TB is working flawlessly with TRIM enabled.
MX500 2TB.png


However, if you experience very slow boot after enabling TRIM. I suggest you go back to HFS+ rather than disable TRIM.
 
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