On Thu, May 13, 2010 at 10:57 PM, Clark Martin <[email protected]> wrote:
> On 5/13/10 1:34 PM, Bruce Johnson wrote:
>
>>
>> On May 13, 2010, at 12:32 PM, Kris Tilford wrote:
>>
>>
>>>> What could have changed?
>>>>
>>>
>>> The battery is lower on charge, and is drawing more amperage than
>>> before. The limit is 500mA total per USB port unless you have an
>>> external USB hub with its own power supply. I've seen this message
>>> before using a USB memory stick to a keyboard port. Since the USB
>>> memory stick doesn't draw significant power, this might be an error
>>> specific to keyboard ports that you can safely ignore, at least
>>> that's what I did.
>>>
>>
>> Also the Mac keyboard ports are lower power than normal, because
>> they're an unpowered hub. I've seen some older USB flash drives
>> produce that warning.
>>
>>
> There is a maximum of 500mA available from a powered port (on the computer
> or a powered hub). Each device is allocated a minimum of 100mA. The hub
> inside the keyboard, the keyboard itself, the mouse and the camera are
> likely each requesting the minimum of 100mA so that's a total of 400 mA
> allocated. That leaves 100mA still available so this problem SHOULDN'T be
> happening. If the keyboard is plugged into an unpowered hub you could get
> this problem.
>
> USB is in many ways a well thought out specifications but the
> implementation frequently falls short.
>
>
> I have seen some USB devices that request 500mA regardless of what they
> need. I suspect the programmers were just being lazy.
>
> OK, here is what Apple System Profiler says
The Second USB Hub is powered off a power cord while the first is powered by
the USB Bus
*USB Bus:*
Host Controller Location: Built In USB
Host Controller Driver: AppleUSBOHCI
PCI Device ID: 0x0019
PCI Revision ID: 0x0001
PCI Vendor ID: 0x106b
Bus Number: 0x18
*Hub in Apple USB Keyboard:*
Version: 2.10
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
Manufacturer: Alps Electric
Product ID: 0x1001
Vendor ID: 0x05ac (Apple Computer, Inc.)
*USB-PS/2 Optical Mouse:*
Version: 27.20
Bus Power (mA): 100
Speed: Up to 1.5 Mb/sec
Manufacturer: Logitech
Product ID: 0xc044
Vendor ID: 0x046d
*Apple USB Keyboard:*
Version: 1.02
Bus Power (mA): 250
Speed: Up to 1.5 Mb/sec
Manufacturer: Alps Electric
Product ID: 0x0201
Vendor ID: 0x05ac (Apple Computer, Inc.)
*USB Bus:*
Host Controller Location: Built In USB
Host Controller Driver: AppleUSBOHCI
PCI Device ID: 0x0019
PCI Revision ID: 0x0001
PCI Vendor ID: 0x106b
Bus Number: 0x19
*Hub:*
Version: 1.00
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
Product ID: 0x0003
Vendor ID: 0x050f
*DataTraveler2.0:*
Capacity: 1.86 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk8
Version: 1.00
Bus Power (mA): 100
Speed: Up to 12 Mb/sec
Manufacturer: Kingston
OS9 Drivers: No
Product ID: 0x160b
Serial Number: 0809251010162
S.M.A.R.T. status: Not Supported
Vendor ID: 0x0951
Volumes:
*KINGSTON1:*
Capacity: 1.86 GB
Available: 1.72 GB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk8s1
Mount Point: /Volumes/KINGSTON1
*JUMPDRIVE SECURE:*
Capacity: 247.5 MB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk4
Version: 30.00
Bus Power (mA): 100
Speed: Up to 12 Mb/sec
Manufacturer: LEXAR MEDIA
OS9 Drivers: No
Product ID: 0xa431
Serial Number: 00027D02083755180706
S.M.A.R.T. status: Not Supported
Vendor ID: 0x05dc
Volumes:
*Secure II:*
Capacity: 247.48 MB
Available: 16.64 MB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk4s1
Mount Point: /Volumes/Secure II
*Flash Disk:*
Capacity: 123.62 MB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk3
Version: 1.00
Bus Power (mA): 100
Speed: Up to 12 Mb/sec
Manufacturer:
OS9 Drivers: No
Product ID: 0x6025
Serial Number: 124757267656
S.M.A.R.T. status: Not Supported
Vendor ID: 0x0204
Volumes:
*CENTRUM:*
Capacity: 123.61 MB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk3s1
Mount Point: /Volumes/CENTRUM
*Hub:*
Version: 1.00
Bus Power (mA): 100
Speed: Up to 12 Mb/sec
Product ID: 0x005a
Vendor ID: 0x0409
*USB Device:*
Capacity: 1.84 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk9
Version: 0.10
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
OS9 Drivers: No
Product ID: 0x915d
Serial Number: USB Device
S.M.A.R.T. status: Not Supported
Vendor ID: 0x2770
Volumes:
*NO NAME:*
Capacity: 1.84 GB
Available: 1.75 GB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk9s1
Mount Point: /Volumes/NO NAME
*DataTraveler 2.0:*
Capacity: 1.89 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk5
Version: 1.00
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
Manufacturer: Kingston
OS9 Drivers: No
Product ID: 0x6545
Serial Number: 001D0F0CAAD35B89050E035B
S.M.A.R.T. status: Not Supported
Vendor ID: 0x0930
Volumes:
*KINGSTON:*
Capacity: 1.89 GB
Available: 1.08 GB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk5s1
Mount Point: /Volumes/KINGSTON
*TD Classic 003C:*
Capacity: 492 MB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk6
Version: 1.00
Bus Power (mA): 500
Speed: Up to 12 Mb/sec
Manufacturer: Memorex
OS9 Drivers: No
Product ID: 0x0008
Serial Number: 0EE02C510242B8CD
S.M.A.R.T. status: Not Supported
Vendor ID: 0x08ec
Volumes:
*TRAVELDRIVE:*
Capacity: 491.98 MB
Available: 428.88 MB
Writable: Yes
File System: MS-DOS FAT16
BSD Name: disk6s1
Mount Point: /Volumes/TRAVELDRIVE
--
Steve Conrad
Henrietta, MO 64036
"The time has come for mankind to grow up and leave its cradle behind; to go
forth and claim our place in outer space."
- Capt. Henry Gloval
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Help Bunny Take Over The World!
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