WD7500KMVV external sata ata drive powering on but windows doesn't recognize it. Connected via USB.

try to see if this will help NEED HELP purchase Masscool external Hard Drive enclosure USB running...

ERROR 43? Check your SATA connection.
HERE'S HOW I FIXED MINE.
(IE. Computer tries to install driver for BD burner, but ultimately fails, and gives the message. "Unsuccessful" and/or "Microsoft Windows stopped device. Error 43") The SATA CONNECTION on my BD burner's EXTERNAL CASE had gone bad.
TO TEST IT. I used a SATA/IDE to USB Adapter Cable I bought for about $10 on amazon.

• I unscrewed the external case to get at the internal drive, and plugged the SATA adapter cable directly into the internal BD burner drive (bypassing the case assembly), and plugged the other end into my computer USB port.
  • PS My BD burner POWER was working OK, so I left the big white 4pin power adapter connected to the original external case.

VOILA! Both my laptop and my desktop PC recognized the LG BD burner again and assigned it a drive letter (like it used to do).

• Now I either need to (1) Buy a NEW EXTERNAL case ($10 - $30), (2) install it as an internal drive (could get problematic if "ANYDVD" is installed) or (3) just leave it connected via the cheap adapter cable.

It's super EASY (& inexpensive) to TEST this before spending $$$$ on a new equipment.
Hope this helps someone. It had me miffed for a while there.

USB hard drive is a portable external storage device that works just like a conventional hard drive. The device is simply plugged into a USB port on your computer as you would connect a flash drive. Unlike a flash drive, however, a USB hard drive can store a much larger amount of data. If your computer will not recognize your USB hard drive, you can try troubleshooting steps to resolve the problem.

Plug one end of the USB cable into the port on your hard drive and plug the other end into the USB port of your computer. Ensure that both ends of the cable are connected securely. Open "My Computer" (Windows XP) or "Computer" (Windows Vista/7). The USB device should be listed as "removable disk" once it is plugged into the computer. If it is not listed among the available drives on your computer, proceed to the next step. Ensure that the data cable is working properly. Try another USB cable if you have one available. Disconnect all other USB devices from the computer as they may interfere with the operating system detecting the external hard drive. Reboot the computer if the USB hard drive is still not recognized. Plug the USB cable into another USB port and check to see if the device is detected. If you are using a USB hub, remove the device and plug the external hard drive directly into a USB port. If the computer still fails to recognize the device, the external hard drive itself may be experiencing a hardware problem. Check the status of the hard drive in the "Device Manager" window. Under Windows XP, right click "My Computer" and select "Device Manager." For Windows Vista and Windows 7, click the "Windows" button in the lower left corner of the screen, then type "Computer Management" in the search bar and press "Enter." Select "Device Manager" in the "Computer Management" window. In the Device Manager window, click the "+" sign that appears beside "Disk Drives." If the external drive is not listed, click "Other Devices" in the Device Manager window and see if an "Unknown Device" appears. The external hard drive may have been detected but the device is not working properly. If it is still under warranty, take the device to the computer store where it was purchased to have it repaired or replaced. Hope this helps.

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1. Serial ATA:  If you have a 3.0 Gbit/sec SATA drive that is not being detected by your 1.5Gb/sec SATA controller, or it causes your system to lock up when connected to a 1.5 Gbit/sec SATA controller, you may need to jumper your 3.0 Gbit/sec SATA drive to the slower speed of 1.5 Gbit/sec for the system to recognize it properly. For further information on changing the jumper setting to slow down your SATA drive's transfer rate, please see Document ID: 193775. 
   - -- (Click to expand) Jumper settings for Seagate SATA drives 
   - -- (Click to expand) Jumper settings for Maxtor-brand SATA drives 
   
   ATA:  It is recommended that all Seagate ATA hard disks supporting the Cable Select jumper option be configured as Cable Select. If your computer system was built prior to October 1998 and does not support UDMA 66 or greater you will be required to use the Master/Slave jumper settings. 
   
   - -- (Click to expand) Jumper settings for Seagate ATA drives 
   - -- (Click to expand) Jumper settings for Maxtor-brand ATA drives 
   
   When using Cable Select jumper settings on your ATA drive, all devices connected to the UDMA cable must also use the Cable Select setting. The cable decides master/slave device detection when the cable select jumper settings are used. Please consult Document ID: 196299 for further instructions. 
   
   

2. Faulty Hard Drive

   If you have completed the above checks and procedures and the drive is still not properly detected, please attempt to use Seatools for DOS (see the tutorial here) to test the drive.  If SeaTools does not detect the drive after the steps followed above, or an error code that signifies drive failure displays, please proceed to the our Warranty Services page to begin a warranty replacement order.

could be the laptop cannot give the external drive enough power via usb. could try plugging it into a powered usb hub to see if that helps

First, open the external casing.
You'll find an "internal" CD/DVD drive, connected to an adapter, and the adapter connects to the USB cable.

Now, look at the adapter -- it could be a "parallel-ATA" interface, or it could be a "SATA" interface. The new CD/DVD drive will have to have the same connectors (data and power) as the adapter.

You might have to exchange the SATA device for a Parallel-ATA device.

If you have a parallel-ATA CD/DVD drive, look at the back of it.
There is a tiny jumper, and a few labelled settings:

* MA(ster)
* SL(ave)
* C(able)S(elect)

Move the jumper to the 'MA' setting, so that the USB-adapter will recognize the CD/DVD drive.

Connect the drive to the adapter.
Close the case.
You're good to go!

Try using another USB cable or different port on your PC. It also may be that it needs external power, Check to see if its plugged in to the wall, if it is, it may be that you need a new power supply.

This is a quote from VIA:

"CHIP FIRM VIA issued a note to its customers telling them of problems with chipset support for hard drives using the Serial ATA II standard.
It said that VT8237 and VT8237R chipsets don't provide forward compatibility for S-ATA II, which is important as hard drive makers are beginning to manufacture this type of drive.

But Via is readying the release of VT8237R Plus, which will solve the problem. This means that motherboard makers that use the former chipset should clear their inventory before September.

Hard drive manufacturers position with S-ATA II is as follows, said Via in its note. Western Digital and Samsung are already shipping these devices, while Seagate and Maxtor will start shipping them during this quarter.

If you connect S-ATA II drives to an old Via chipset which includes the VT8237, VT8237R, VT6420 and VT6421L, the devices won't be detected.

Some mobo makers, such as Epox, have already responded to the problem and have warned their customers to seek the support of hard drive vendors. In a letter to its customers, it said that they should also check the specs of other manufacturers' Via based motherboards."

the situation here is ahppening to all external sata or Esata drives what happens is the external closure has a usb controller when this dies the drive doesn ot spin up or does not reconise simple solution buy a external drive encloser and transfer the drive to it and that will work. thanks and please rate.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Try hooking it up to a different USB port. Go to computer on the start menu and see if your computer sees it. Try restarting your computer with the hard drive already connected and turned on, the computer may recognize it then.