Computer does not see my external hd. Music on the external.

December 8, 2011 at 10:44:54
Specs: Windows 7 home premium, 2.93 4 igigs
pc not seeing my external hard rive. Music on the external.
how do I get the pc to see the external hard drive?

Bill


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#1
December 8, 2011 at 12:09:53
Can you see it in Disk Management
right click my computer then manage and on the left hand side click disk management

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#2
December 8, 2011 at 12:20:13
madmax, no, not seen. I had this external working fine on this pc. Unhooked every thing from the pc. Hooked every thing back up and the pc is not finding the external.
Hooked the external to my other pc and it shows fine. The pc that shows the external is running win 7, the one I'm having trouble with has xp...but the external was showing and working fine on xp till I unhooked and then put it back together.

Bill


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#3
December 8, 2011 at 13:42:44
The exterenal hard drive must show up in at least Disk Management in XP.

You may need to connect the external hard drive to a different USB port.
The USB port (or two USB ports) you connect it to must be able to supply 500ma of current.

If it shows up in Disk Management but not in My Computer or Windows Explorer in XP, you have probably damaged partition table data on the drive becuase you unplugged it without using Safely Remove Hardware to stop accessing it while Windows was running - usually that problem can be fixed by using a specific program to fix the problem.

More info...

Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
http://www.computing.net/answers/ha...


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#4
December 8, 2011 at 13:58:15
The whole thing that throws me is I had this working fine on xp, same pc. I have two external hard rives with the same music on both. When I plugged one of them in to the xp pc, it would assign it a drive letter and run fine. I am now reinstalling xp pro on the pc and I'll see what I get when all is done. I appreciate the input from you guys. Thank you.

Bill


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#5
December 8, 2011 at 15:45:44
You DO NOT need to re-install the operating system to fix your problem !

The problem is with the external drive, or with how you have it connected, not the operating system !

If it shows up in Disk Management in XP but does not show up in My Computer or Windows Explorer in XP when it did in XP previously, it will not show up in ANY other operating system either, e.g. In Computer or Windows Explorer in Vista or Windows 7.


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#6
December 9, 2011 at 09:50:18
Tubesandwires,
The external does not show up any place on the pc I am trying to put it on. Some times it will show as found new hardware, then disappears. I just unplugged it from the pc I am attempting to put it on and brought it in and hooked it up on my main pc and played some music from it. So the external hd is fine. Hook up is the same on both pc's.

Bill


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#7
December 9, 2011 at 13:33:05
Hooked the external up tp my laptop, running win7, no joy. So I hooked the other external to the laptop, immediately found it and said it was ready to use. These two external hard rives are in the same kind of enclosures and both have the same music on them. So I figured the hd I can't get the xp pc to find is bad, since the laptop doesn't see it. But I bring in to my main pc, the one I plugged it in to in the very beginning and it works fine. So I don't have a clue.

Bill


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#8
December 12, 2011 at 13:40:06
Since the external drive is recognized fine when you plug it into SOME USB ports on SOME computers
- there is nothing wrong with the external drive enclosure's circuits,
- there is nothing wrong with the hard drive inside the external enclosure
- there is no partition table damage on the hard drive inside the external enclosure.
- assuming you are using the same USB cable between the external drive enclosure and the computers in all cases, there is nothing wrong with that cable.

- the USB ports you are plugging into on the computers that DO recognize the external drive fine are able to supply 500 ma of current from the USB port you have the external drive plugged into.
.....

- the USB ports you are plugging into on the computers that DO NOT recognize the external drive fine ARE NOT able to supply 500 ma of current from the USB port you have the external drive plugged into.

As I said in response 3.....

Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
http://www.computing.net/answers/ha...

READ the info at that link, and at the links referred to at that link.

Also - check the USB port you are plugging into to see if it's physically damaged
- the plug should be a snug fit in the port; it should not be loose.
- the outer shell of the female USB port should not be bent
- none of the four contacts inside the port should be bent out of place
- the plastic blocking plug that prevents you from plugging the male USB cord plug in the female USB port upside down should be present and not loose in both the male USB cord plug and in the female USB socket.

While Windows is running and your sound is enabled so you can hear it, you should hear a "dong-ding" sound when you plug in the drive , and a "ding-dong" sound when you unplug it, if the USB port can supply 500 ma of current. You should NOT hear those sounds at any other time, or intermittently.





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#9
December 12, 2011 at 13:51:41
Tubesandwires,
Thought I had posted the solution. The electric plug I was using to plug in to the enclosure was not producing enough juice to make the hd work. I had a hell of a time getting to that solution, but that is what it was. May be my answer will help some one else. Thank you for your kindness.

Bill


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#10
December 12, 2011 at 15:07:47
You didn't mention whether your external drive has a 3.5" hard drive inside of it and came with an external power adapter, or it has a 2.5" hard drive inside of it (often called a "portable"external hard drive) which does not come with a power adapter.

The USB port supplies only +5 v DC.
The USB port (or two USB ports) MUST be able to supply 500 ma of current for an external hard drive, or an external optical drive.

3.5" (desktop sized) drives require both +12 v and +5 v DC.
The hard drive can't get enough current at +5 v from just the USB connection(s) to the computer.

2.5" (laptop sized) drives require only +5 v DC.
Usually the hard drive CAN get enough current at +5 v from just the USB connection(s) to the computer, if it (they) can supply 500 ma, unless it's an older larger capacity 2.5" drive inside the external enclosure.

If it DOES have a 3.5" drive (or more than one of them) inside of it and it DID come with a power adapter, you MUST use that power adapter because it supplies +12 v and some additional power (current) at +5 v to the external enclosure and the hard drive, and that power adapter must work properly and have nothing wrong with it's connection to the external enclosure.

I have never seen an external (3.5") drive that has a built in power adapter - they have all had an external power adapter.
You must be talking about a problem with the cord for that external power adapter or it's connection.

It's common for people to pull on the cord rather than the plug on the end of the cord when they unplug an AC to DC power adapter. Eventually the plug on the end of the cord, or the wires inside the cord near the plug, are likely to get damaged when that is done too often. That's a frequent problem with AC adapters for laptops, but that can happen with any external AC to DC power adapter's cord.
If the wires inside the cord near the plug get damaged such that they short to each other, the power adapter can be burnt out easily.
You can buy the same type of plug (same hole diameter, same outer diameter - if the hole is too big you'll have problems). and connect, preferably solder, the wires inside the cable to it, if the adapter hasn't been damaged, but if you continue to pull on the cord rather than the plug on the end of the cord when you unplug the power adapter, that won't last as long as a plug that's molded into the end of the cord.


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