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Firegod

Firegod

Firegod

Soldato
Joined
12 Sep 2003
Posts
10,583
Location
Newcastle, UK
Just an anecdote really. I was copying some files around, not many items per folder, maybes 1-2 items in each folder (a few gig each). Going from a USB3 drive in a front USB port to my m.2 OS drive I was maxing out the transfer.

USB3-to-C.jpg


But I noticed when copying the same item from my m.2 OS drive across to my Samsung 870 QVO SATA drive that the speeds were all over the shop and on average, pretty dire. Slower than the USB3 connection. Ouch.

C-to-Samsung.jpg


So I did a little digging and noticed the drive was set to "power save" mode in the Samsung software. Ahh! Did the same transfer again in "performance" mode.

Performance-Mode.jpg


That's more like it.

I can sleep at night now lol. "Cool Story Bro" gif goes here. :)
 
Aye not quite sadly, it didn't even start quick then die when the cache exhausted - It was just crap from the get go of the copy. Second screenshot kinda shows this. I was only writing a few gig. Soon as I put performance mode on it was like taking the handbrake off. But thanks for the linky!
 
Tetras said:
Not to be a party pooper, but you're sure that wasn't just because the cache was exhausted? (linky)
Click to expand...
I gotchu fam, with my trendy explanation.


Reads are generally faster than writes.

Source be all like "have all the things"
Desto be like "nice one, I can keep some of this here while I write the goodies"
Desto then be like "oh damn, so much stuff, slow down, stop"
Source be like "lame"
Desto "I'm good now"
Source "pathetic, here we go again"
 
Yeah Samsung sata ssds
You can turn on "rapid mode"
As someone said
Basically gives the drive a ram cache
Its useful
But power loss/sudden shutdown
Can lead to data loss
Learned that the hard way
Using rapid mode and did cut and paste
Instead of copy and paste
Sudden power cut and the original data
Wasn't there anymore

No idea if you can also use rapid mode
On Samsung nvme drives too
My only Samsung nvme is sm951
Not classed as a consumer drive so
Unsupported in Samsung magician
 
Last edited:
Firegod said:
So I did a little digging and noticed the drive was set to "power save" mode in the Samsung software. Ahh! Did the same transfer again in "performance" mode.

Performance-Mode.jpg


That's more like it.

I can sleep at night now lol. "Cool Story Bro" gif goes here. :)
Click to expand...
thats some performance mode you got there that more than triples the sata3 interface speed.
 
Will have to check, Im finding that transfer of files is much faster between hard drives and very slow whenever using SSD / USB or nvme
 
Cyber-Mav said:
thats some performance mode you got there that more than triples the sata3 interface speed.
Click to expand...
Like someone mentioned above, this reflects the stage where m2 reads data as fast as possible into ram buffer.
On a longer transfer it will suddenly drop off to sata3 550MB/s speed once ram buffer is full and then drop off again to ~100MB/s once SLC cache on sata drive is full
 
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