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Will the new TRIM capability in 10.10.4 work with External USB attached SSD

brosenz

macrumors regular
Original poster
Apr 26, 2011
219
58
I have a Samsung 840 SSD connected to my MacBook Pro 10.10.4 via USB 3.0, will the new TRIM (forcetrim) capability on Yosemite work on those external SSDs? Thanks
 

dZp

macrumors 6502a
Mar 29, 2006
987
55
TRIM over USB… never did, and probably never will.
PS: it's called trimforce, not forcetrim
 

DeltaMac

macrumors G4
Jul 30, 2003
10,684
2,895
Delaware
Trim IS supported over a Thunderbolt connection, so if trim is that important to you, you can use your external in a Thunderbolt case.
Enable trim on your system, and the external on Thunderbolt will have trim enabled, too.
 

dZp

macrumors 6502a
Mar 29, 2006
987
55
You need an enclosure with a SATA chipset, like a Thunderbolt enclosure ($$$)
Don't get hung up on TRIM. It's useful but not mandatory.
 

Partron22

macrumors 68030
Apr 13, 2011
2,593
767
Yes
Don't get hung up on TRIM. It's useful but not mandatory.
USB-SSD user. I'm tracking performance w BlackMagicDesign's DiskSpeedTest. If it starts dropping off more than I like, I'll just reformat and restore from BU. Haven't needed to yet.
 

pnoguchi

macrumors newbie
Jun 28, 2015
5
0
I am using a Crucial M500 as a boot drive in an external enclosure that uses an eSATA to Thunderbolt connector. Have trim enabled by Trimforce with no problems so far. It's a big hoot that TRIM commands are not transmitted over USB or FireWire...
 

brosenz

macrumors regular
Original poster
Apr 26, 2011
219
58
I am using a Crucial M500 as a boot drive in an external enclosure that uses an eSATA to Thunderbolt connector. Have trim enabled by Trimforce with no problems so far. It's a big hoot that TRIM commands are not transmitted over USB or FireWire...
I haven't been able to find a Thunderbolt - SATA adapter at a reasonable price, do you have a suggestion? thanks
 

pnoguchi

macrumors newbie
Jun 28, 2015
5
0
Unfortunately, the most inexpensive one that I've seen is the Kanax adapter, which is about the same as an eSATA external drive case.

Ironically, some older PCs and laptops have a couple of eSATA ports that work fine with the eSATA case I have. In fact, that's how I was able to upgrade the Crucial SSD firmware on a older PC ThinkPad laptop.

It's a real shame that Thunderbolt is relatively so expensive compared to USB 3.x; even a Thunderbolt cable is what, $40 about; and Thunderbolt cases and drives are all more expensive than a USB case or drive.

It makes it unfortunately difficult to take advantage of the new trim enable command in 10.10.4 and 10.11 beta. An external drive is so much easier to work with, rather than having to install a SSD internally on a mac.
 
Last edited:

sim667

macrumors 65816
Dec 7, 2010
1,374
2,883
I've been trying to find this out for a whil, is trim something that needs to be running in the background as a realtime process, or can you trim a drive occasionally like you would a verify disk etc?
 

crjackson2134

macrumors 601
Mar 6, 2013
4,746
1,904
Charlotte, NC
I've been trying to find this out for a whil, is trim something that needs to be running in the background as a realtime process, or can you trim a drive occasionally like you would a verify disk etc?

It's most efficient to enable trim system wide (runs silently all the time). You can however trim manually when wanted. Disksensei provides that ability I believe.
 
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