How to check if MPB gts too little power from mains?

nelly22

macrumors 6502
Original poster
Sep 29, 2009
351
5
Is there any way to check if MBP is getting too little power from mains?
 

Samuelsan2001

macrumors 604
Oct 24, 2013
7,682
2,103
If your battery doesn't charge it's getting too little power.

Do be aware that it is possible for your computer to use more power than the charger can provide, so if you are maxing it out while plugged in the battery can still deplete, this only seems to happen in highly intensively games as far as I have seen but it could happen with other processes.
 

nelly22

macrumors 6502
Original poster
Sep 29, 2009
351
5
Why do you think its not getting enough juice?
I have two laptops in same table and both have external USB-powered HDD and both HDDs have been lately disappearing from Finder sidebar.
 
Last edited:

maflynn

Moderator
Staff member
May 3, 2009
63,831
30,345
Boston
Sounds like the external drive/USB is having issues and not that the your laptop is getting insufficient electricity
[doublepost=1476882161][/doublepost]Did you try using the hard drive in a different usb port?
 

killawat

macrumors 65816
Sep 11, 2014
1,443
2,185
I only get this when trying to use cables that are too long. Using smaller bulkier cables works fine.
 

Fishrrman

macrumors P6
Feb 20, 2009
17,153
5,519
nelly wrote:
"I have two laptops in same table and both have external USB-powered HDD and both HDDs have been lately disappearing from Finder sidebar."

I'm wondering if the drives aren't getting enough "USB bus power", and that's the reason they're disappearing.

Other possibilities:
- loose cabling
- sleep/wake issues
 

jerryk

macrumors 601
Nov 3, 2011
4,840
2,397
SF Bay Area
If you drive does not have external power adapters, connect it via a powered USB Hub that support at least a 2 Amp power supply. Let that power your drive.