Question Running 850 EVO SSD (1.4A peak draw) on USB 2.x (0.5A max)

[Turbonium]

I'm currently zeroing a Samsung 850 EVO drive using a higher quality USB to SATA cable. Thing is, the drive says it needs 1.4A, and I'm running it on an older USB2 port (despite the cable supporting USB3); USB2 only support 0.5A power delivery, and this cable is only a single USB plug (not 2/not a Y cable), so how is this thing running?

 

[Turbonium]

I realize this may not be a "pro" question but really, could use an answer.

Just wondering how the drives even ran on "only" USB2 power.

 

[In2Photos]

Where are you getting those numbers?

According to this spec sheet the max power consumption is 3.6W. At 5V that is 0.72A.

According to the WIKI for USB2, power delivery is 1.5A.

 

[Turbonium]

Where are you getting those numbers?

According to this spec sheet the max power consumption is 3.6W. At 5V that is 0.72A.

According to the WIKI for USB2, power delivery is 1.5A.

The physical drives say they're rated at 5V 1.4A on the labels.

I don't know how that translates, though.

 

[burninatortech4]

The 850 EVO will never approach 1.4A.



Source: https://semiconductor.samsung.com/consumer-storage/internal-ssd/850evo/

I'd check that there isn't anything wrong on the port or host side. I've done loads of 850, 860 EVO data backups with a USB -> SATA adapter. Never had any issues.

 

[Hail The Brain Slug]

According to the WIKI for USB2, power delivery is 1.5A.

No idea where you got that, it clearly states this under the power section:

"USB up to 2.0 allows a host or hub to provide up to 2.5 W to each device, in five discrete steps of 100 mA"

 

[In2Photos]

No idea where you got that, it clearly states this under the power section:

"USB up to 2.0 allows a host or hub to provide up to 2.5 W to each device, in five discrete steps of 100 mA"

Under the history section for USB 2.0.

 

[Hail The Brain Slug]

Under the history section for USB 2.0.

View attachment 89496

I don't know if that applies here. The port and device both have to support battery charging 1.2.

"The portable device and USB host or hub both need to support BC1.2, which detects the USB D+ and D- contacts. Once this is complete and support for BC1.2 is confirmed, Vbus provides 1500mA current for recharging"

I seem to recall ports supporting this being pretty rare, a system might have one and it was specially labeled. Any random USB 2.0 port very likely doesn't support it.

 

[Turbonium]

The 850 EVO will never approach 1.4A.

View attachment 89485

Source: https://semiconductor.samsung.com/consumer-storage/internal-ssd/850evo/

I'd check that there isn't anything wrong on the port or host side. I've done loads of 850, 860 EVO data backups with a USB -> SATA adapter. Never had any issues.

What do you mean "anything wrong"? And by host side, you mean the machine I hooked it up to for the wipe, right?