Question about Inland (08304) 4-Port USB Hub

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What is this small round hole for???

I just bought an "Inland USB 2.0 Mini 4 Port Hub" today. The model # is MC702639.
It is silver and has the obvious 4 USB plug receptacles on the side. On one end of the rectangle unit, the wire is attached that I am to connect (plug into) my computer..., also obvious.
At the other end of the rectangle unit there is small hole that appears to be  for some sort of other plug. Since I didn't get any instructions for this unit and there is no mention of this "whole" My questions is, am I missing something?? What is this socket used for.
Thank you

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  • dark_knig810 Nov 23, 2008

    Mr. Guru,


    YOU ARE THE MAN!!!!! 


    Thank you so VERY much for responding to an "END user" like me. I didn't really expect to get any response and yet..., here you are.


    Though I am the Dark_Knight....., YOU sir, are a Knight in good standing...., and I salute you.


    Holidays too you Sir.


    PS: The Hub unit works fine..., I was just wondering

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Although i have not seen your device specifically i looked it up and that unit if I am not mistaken has an option to plug a switching power adapter on it IF and only IF in case you might need it to power on additional devices. Some USB devices need more power than normal hence the adapter but any device that runs on its own power and small USB devices dont need such power then you do not need the external adapter ( Sold separately and not by the same company) Basically you are not missing anything dont worry if the unit works as it should then you are ok.

If you need further assistance just message me.

Posted on Nov 23, 2008

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AC power adapter plug. Not normally needed.

Posted on Nov 23, 2008

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I have several computers at home, and none og them can recognize this portable device. Hitachi 250 GB Mod: SDM/250RW


1) Power:

It may be the problem that occurs with a lot of USB powered devices jrherrer. Not enough power provided.

The USB cable plugged into the computer, provides signal wires for transferring information back, and forth, and also provides 5 Volts DC for power. (Two D cell flashlight batteries produce 3 Volts DC)

http://en.wikipedia.org/wiki/USB

[ Below shows the Signal pins, and the Voltage pins of the USB B Mini style connector, (Male), used to connect to the SimpleDrive Mini external harddrive,

Pin 1 is for the 5 Volts DC Positive (Wire color - Red)
Pin 2 is for the D- Signal (Wire color - White)
Pin 3 is for the D+ Signal (Wire color - Green)
Pin 4 is not connected. (Or sometimes joined to Pin 5 with a Resistor)
Pin 5 is for the Ground (Wire color - Black)

Just added info in case you wanted to know ]

From what I see the SDM/250RW has a USB port on the side, and a DC Power Jack, used for an AC adapter, also.
(Round port with a pin in the center)

http://www.hitachigst.com/tech/techlib.nsf/techdocs/0C876B7AB91B23988825773F006BEA02/$file/SD_Mini_DS_final.pdf


From what I see stated from Hitachi, and sellers on the 'net, the AC adapter may not be provided.
Many of those who provide a review state that both the USB cable, and the AC adapter is needed to provide enough power. Seems to be a power hungry external harddrive

It's a 2.5 Hitachi SATA laptop harddrive inside that external case. (The Harddrive is 2 and a half inches across in Width. Common size used for laptops)

When using an external device powered by a USB cable there are general guidelines to follow,
A) The USB cable should not be more than 2 feet in length
B) Connect the device directly to your computer, instead of through a hub, or other device, unless the USB hub has it's own power.


2) USB cable:

Could be a faulty USB cable, although I imagine you have tried different ones by now.


3) Interface Circuit Board:

The Hitachi SATA 2.5 harddrive inside the SImpleDrive Mini SDM/250RW, plugs into a small circuit board located inside that external case.

Components on the circuit board may be fried, or the Harddrive may have come loose from the interface.

Loose from the interface
To explain;
The back of the harddrive has connector pins sticking out.
The interface has socket holes which the pins insert into.

Faulty circuit board
The external case of the SimpleDrive Mini SDM/250RW can be carefully opened up, and the Hitachi SATA 2.5 harddrive extracted out.

Another inexpensive external case for a 2.5 SATA harddrive can be procured, and the Hitachi harddrive put in it.

Example of a 2.5 SATA external enclosure,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3743049&CatId=2781

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