Left USB provides less power than right?

I've noticed that my left USB won't power my external HDD. But it seems to provide some power because the light comes on the drive and i can feel it spin some. Plugging it into the right USB works fine. it mounts right up.
any reason why one would give more power than the other?

It's not only a Mac problem, I get the same thing on my desktop Windows PC with it's front two USB ports, if I plug a USB HDD into the front ports the drive just clicks and does not mount but if I plug it into the rear ports no problems - think as S.U. said it's because the front are connected to the MoBo via a header and longish wires so can not provide the power needed to run a device like a HDD ?!
custom mini

Similar Messages

Is it true that sleep consume less power than boot? (MacBook pro late 2011 model)

I have 3 questions here to ask:
1. Some say that sleep consume less power than boot, but some say it isn't. Which is true? and how it can be?
2. Is it true that charging your macbook pro until 100% then unplug it will make cycle count go faster than using AC power all day and ONLY using battery when we couldn't find AC outlet will make it slower?
3. i found that some macbook user leave their macbook charged all the time and some macbook user prefer use battery all the time. Which way is better? i have observed and looked at any apple help topics but couldn't get the answer without any experience from you guys...
I'm so conserned with these issues...
Thank you for your time though, i hope i can find the best solutions here....

Regarding question 1, that's a meaningless question. Boot uses a specific amount of power, dependent on how much stuff has to start up on your machine and what hardware you have, while sleep uses a trickle over time, so whether this is true depends on what interval of sleeping you're comparing to boot. There will be a break even point somewhere, but where that might be isn't clear.
Apple recommends sleep over shutdown unless you're going to be away from the computer for a couple days or more. Of course, I can't find a reference to that document now, but I know it was there at one point in time. I don't think that the entire issue is power-related, as boot will stress the hardware slightly more (lots of reading from and writing to the hard drive, etc) than sleep.
As to questions 2 and 3, the answer is the same for both. Your battery lasts for a finite number of cycles before losing capacity. (How many cycles is a good question, and not an easy one to answer.) A cycle is defined as going from full to empty, but can be broken up as well. For example, if you start from full, drain halfway, charge to full again and drain to halfway again, that's one cycle. So, the more times you charge your battery, the faster it will wear out, but how you do it doesn't matter much.
There are a couple gotchas, though. First, a battery can wear out prematurely if you never let the electrons "turn over." You need to use it on battery power sometimes, though it doesn't have to be daily by any means. Second, if you drain the battery fully, that's not very good for modern batteries. I wouldn't worry about it now and then, but don't make it a habit of draining it fully. (Some people erroneously recommend frequently draining the battery fully and then charging it back up to "condition" the battery, but that is not actually good practice. All Mac portables with built-in batteries do not need conditioning.)
Finally, all this is fairly irrelevant if it interferes with the way you need to use the machine. Use the machine the way you need to use it, and don't worry so much about adjusting your needs to fit the battery's needs. If that means you have to replace the battery a little more frequently, so be it. They're not that expensive in the grand scheme of things.

Does using headphones use less power than using the speakers?

Just wondered if using headphones in a good way to save power when out as I seem to me running larger speakers in the mac would use more energy than little apple pod headphone's.
Perhaps someones looked in to this and know how much power in needed per minute for each.

Very doubtful. For the MBA the two big consumers of electricity will be the CPU and the display's backlight. Following that would be WiFi and BlueTooth.

HT1430 My new iPAD3 has uneven brightness on screen. Left half is brighter than right half. Any suggestions how to fix it?

My new iPAD has uneven brightness on screen. Left half is much brighter than right half. Any suggetions to fix it or shall I go for warranty replacement?

If restarting or rebooting doesn't resolve the issue and the device is new, I would contact Apple or wherever you bought the iPad, show it to them and if they can't figure out, ask for a replacement.
Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

USB 2.0 power low?

I just upgraded from a powerbook G4 to a MacBook Pro. My blackberry would charge from empty to full in about an hour on the G4, and takes several hours on the MacBook Pro. Either port is the same long time.
Are the new machines providing less power to the USB port?

Ricktoronto wrote:
SInce people complained constantly about the lack of power in the G4 Powerbook ( not enough to power most external USB drives was typical) it is not likely the MacBook Pro has less ( in part since it powers USB drives quite well).
I would say it depends on which port your using. I seem to have lots of power issues with the left USB (next to MagSafe port) and non with the right one. A Apple genus seem to think it's something about one being on the main logic board and other on a daughter card. However, you'd think Apple's engineer would of made them both the same? :s

Inadequate Power to Left USB of MBP 15

Searching through the discussion forums the subject seems to be a common problem ... the left USB port on 15" MacBook Pros doesn't provide enough power to run an external 2.5" hard drive via the bus. However, the right USB port seems to work fine.
It isn't a really big deal as I rarely to never need to plug in two external drives, but if possible, I'd like to get this fixed while my MBP is under warranty.
So here are my questions:
o Has anyone with this problem (I'm assuming the problem is shared by all, they just don't know it?) had it successfully repaired?
o Is there literature on the tech specs that would indicate the USB ports are different in some way?
By the way, I have a Core 2 2.2, I purchased it right after the LED LCD switch.

I'm not sure how you can go about testing the power output for the ports but if LH port is giving less than the 500mA claimed then it should be a warranty repair. If, on the other hand, it's giving 500mA then the issue may be with the drive, then the third party drive warranty should apply - either on the basis that the drive is wanting more power than specified or that it is unsuitable for the purpose it was advertised to meet.
Is there some option for checking the power output of each port?
Of course another option may be for the drive manufacturer to update the firmware so that the drive does what they claim it can do - ie work properly.
In my experience Apple are quite good at working with other parts manufacturers to resolve compatibility problems, albeit often with significant delays before a solution is provided. I suggest that more of us should let Apple know through their on-line bug reporting procedure about problems that seem to have no easy solution. I don't have the url for this handy. Can somebody provide this again please?

When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available. This is new. Thumb drives worked last week. Any suggestions? Is this an apple or a Lexar issue?

When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available. This is new. Thumb drives worked last week. Any suggestions? Is this an apple or a Lexar issue?

Apple intentional, use a powered USB hub instead.

Will the PB G4 USB-ports provide sufficient power for external HDD ?

I am in the market for a 2,5in external HDD, preferably powered through the USB-ports of my PB G4. However, I have read that in many cases, Apple's laptops provide insufficient power for such devices. Is this a fact?
The drive I'm currently looking at: Western Digital Passport 120GB USB2.0 (WD Passport WDXML1200UE)

Dear Thosen, yep this can be a problem with the 12' models, I think that there are adaptors, that use both USB ports, one of power and one for data transfer. The other option is to try a firewire drive - this has the added advantage of being bootable.
bw
Andrew Platt

Left USB and Right USB work differently ?

I v a USB sound cart (MBox 1 by digidesign)
Wen I use togeteher with it an external hard disk connected with USB (some time the fire wire is occupied by another hard disk) if the USB hard disk is on the left side (looking the screen) and the MBox on the right...the hard disk start making a "periodic" sound similar to a metronome and it doesn't run....if I invert the positions it work fine.
Is this normal ?
tanx
Shiama

I had this problem about 2 weeks ago. I called digidesign and told them my mbox was not working properly i kept getting the error message about increasing buffer size. they said that the usb ports on the mbp's are different and digi does not support the usb port on the right. so i tried the left and it hasn't given me problems since. although now i just got a new replacement so hopefully it will still work. on the online protools manual it said digi doesn't support the left usb port on the mbp.

Myth or Truth, iMac uses less power in Standby than when off

I'm sure I read this somewhere on the internet.
I'm not sure what model it was for, but I heard that the imac uses less power when in sleep than being shutdown (when still plugged into the wall)
Can anyone confirm or denigh this?
Ifs it true any web links to this?

If it's powered off, it's using no power at all.
I suspect this is about the power cost of waking from standby versus pwoering up from off, and whether it makes more sense to leave your Mac in standby when out of use or whether to swticth off completely.
It depends on your usage pattern. If you leave the Mac unused for very long periods of time, it makes sense to power off, because standby uses a little power constantly. If you leave it unused for shortter periods, you probably use less power in standby.
Unfortunately, I don't have a magic number for the time period
As a rule of thumb, I'd say if it's unused for less than a day or so, standby makes more sense. There's a discussion at the link below which also fails to give a definitive answer but has some interetsing comments.
http://apple.stackexchange.com/questions/7588/for-least-power-usage-should-i-tur n-off-or-put-my-mac-to-sleep

USB Joystick AND Gamepad pulling right?

I have a Saitek 3D Cyborg Gold joystick. When playing Battlefield 1942 and when sitting in the properties page for the joystick in Windows, I noticed it pulled to the right quite severely and quite often. At first I wrote this off to the joystick, drivers for the joystick, or something like that.
However, just this evening I disconnected the joystick from my PC and connected a gamepad (in a different USB port). Now it pulls to the right too! This makes me worried that it might be a problem with the USB drivers or the USB ports on my mobo themselves. Has anyone else experienced this sort of problem or have any suggestions on how to troubleshoot and determine what the problem really is? I'm running the newest everything reported by MSI Live Update except for the newer Promise RAID drivers they posted since they cause my systyem to BSOD on boot every single time.
On a secondary note, and this prolly isn't related... occasionally, about once every 4 or 5 days, my system dies for no reason. The monitor goes off as if it is being turned off by power management, but all the PC fans and such keep on going. It happened once while I was burning a DVD and the DVD continued to burn for 5-10 seconds after the monitor went off and then it died too. The PC is completely unresponsive to the keyboard, mouse, or anything. I have to hit the reset button or hold down the power button for 15 seconds to power it off. At first I thought it was my PSU (it was only a 400W and did not meet the amperage ratings suggested on this forum in other posts)... I now have a 520W Vantec PSU that provides much more than necessary for my system and it still happens. I suspect my video card.
Anyhow, thanks for any suggestions!
OtakuCODE

Wow I've had a similar problem for a while with my logitech pad, never thought of it being anything other than logitechs drivers or faulty hardware.
My problem is that the pad works fine when first connected, but after 5 minutes or so of play the left analogue stick only registers about halfway when I push it right - i.e I can only walk to the right instead of running, or am unable to turn a car sharply enough.
When I go back to the gamepad properties I can see this problem and calibration doesnt fix it. Unplugging and re-inserting the USB plug fixes it for a short time but then it degrades again. I had given up on this - anybody fixed it? It happens when using XPs default drivers, or the only other two Logitech drivers I can find, so Im pretty sure thats not the problem. I'm using SP1's USB 2.0 drivers

USB ethernet does not work in left USB port

My USB ethernet adapter does not work in the left USB port on my MacBook Air, but it works in the right side. Other devices, like my mouse, work fine in both ports.
Could I have a faulty left-side port with too little power for the ethernet adapter, or is this normal for MacBook Air?

I have the same problem.
USB Ethernet doesn't work with the left USB port. It does work with the right USB port, and any other USB device works with the left USB port on my macbook air
Any solution to this problem?

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You didn't say what phone you have - but you can set it to update and backup and sync over wifi only - I'm betting that those things are happening "automatically" using your cellular connection rather than wifi.
I sync my email automatically when I have a wifi connection, but I can sync manually if I need to. Downloads happen for me only on wifi, photo and video backup are only over wifi, app updates are only over wifi....check your settings. Another recent gotcha is Facebook and videos. LOTS of people are posting videos on Facebook and they automatically download and play UNLESS you turn them off. That can eat up your data in a hurry if you are on FB regularly.

I updated to 10.4.7 and now my left USB port doesn't work

Hi all,
I ran Software Update just a second ago, installing an update to MacOS (PowerPC), ITunes, and QuickTime. After the install and the restart, my left USB port is no longer working. It was working immediately before the install.
I have verified that the peripheral that was not working in the left port works just fine in the right one. I have also confirmed that a peripheral that was working previously in the right USB port doesn't work when attached to the left one.
Therefor, I am led to believe that the problem lies in the left USB port. The only thing that has changed is the updater which ran moments ago, and again, the left USB port was working just fine prior to the install.
Has anybody else experienced this problem and knows of a fix/patch/anything I can do?
PowerBook G4 Titanium Mac OS X (10.4.7)

Welcome to the Apple discussions.
I would reset your power management unit, then install the combo 10.4.7 update. Recently, there have been issues with updates through the software update function.
Reset the PMU: http://docs.info.apple.com/article.html?artnum=14449
Download combo 10.4.7: http://www.apple.com/support/downloads/macosxupdate1047comboppc.html

USB-Hub not working on LEFT USB port?

Hello,
I have installed Windows 7 Ultimate 64 Bit on my MacBook Pro 13" Retina (Early 2013) and it's running fine. Boot Camp version: 5.0.5033.
But I have one problem: I bought an external monitor (Dell U2414H) which has an built-in 4-Port USB 3.0 hub. So I connect the Dell monitor using a DisplayPort 1.2a cable and an USB 3.0 cable. But Windows only recognizes the monitor's built-in USB hub when I plug the USB cable into the right USB port (when I sit in front of the MacBook). Then it works without problems. But when I plug the USB cable into the left USB port of the MacBook Windows only says "USB device not recognized". But other devices like USB sticks and USB drives also work without problems on left and right USB port of the MacBook. Also when I boot in OS 10.9 Mavericks the monitor's USB hub is working on both USB ports of the MacBook. So I think it isn't a hardware failure. I also re-installed Windows, but I have still the same problem.
Do you have any idea, why only the monitor's built-in USB hub is not working in Windows on the left port of the MBP or even how I could fix it?
Is Boot Camp 5.0.5033 the most current version? I checked the box to download the latest Windows support software and also didn't find anything newer than 5.0.5033 to download, but sometimes I read about 5.1.1 - but where could I download it? AND: Doest it help?
Thanks in advance!

I think I've hit a variation on the problem you're enoucntering. I have a late-2013 13-inch Macbook Pro Retina. I've just installed Boot Camp and a copy of Windows 7 Pro. This is my first experience with Boot Camp and Windows on a Mac, so I'm in foreign teritory.
The install all went fine and Windows 7 booted up fine and so far, all hardware seems to be working as expected, with one exception. Things went sideways when I tried use it in "clamshell" mode - lid closed with external monitors and all my peripherals attached to a USB hub. I set up Boot Camp to boot into Windows and attempted to boot. It would give me the usual boot-up fanfair and a then a gray screen for a few seconds, and then it would reboot. It just rebooted over and over. I eventually discovered the issue was the USB hub - without the hub connected , it would boot just fine. Once it was booted into Windows, I could attach the the hub and everything would be recognized normally. Furthermore, I could put the system in sleep mode, wake it up and everything would be working fine. But it simply refuses to boot the USB hub attached. I've stumbled on a couple related threads - see https://discussions.apple.com/message/23802231#23802231. The suggestion is that only certain hubs to not work. I've got two different high quality powered hubs and both display the same behaviour. The other point is, that when booting into OS X with the same hub, it works perfectly. So it's a strange problem.
Note that after reading your post, I did try the hub in both right and left USB ports and that made no difference in my case. I do have one more hub to try (built into my Dell monitor). I'll report back if that happens to work.

Left USB provides less power than right?

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