Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Has anyone used this as replacement supply for the old 750GB Blue Ringed WD My Book drive (WD7500P032)? Thanks
Document: After having a problem with my 5 year old WD 1tb My Book hard drive, it dawned on me that it might be the power supply. I found this one and ordered it. I powered up the device with it and the drive ran like it never missed a beat. I have had it for 6 weeks now and no problems. It delivered as advertised. I would definately purchase another Pwr+  power supply again!
Nice replacement power supple for external hard drives but I believe the price is a bit steep. I used it to replace my WD MyBook's power supply when I lost it.
This is a perfect replacement for my WD My Book Essentials external drive after losing the original cord. Highly recommended and much cheaper than the OEM.
I used the previous power supply for another application and this was the replacement which I am very pleased with. I has function the way that it was expected to and has not given me any problems
My original WD Book adapter recently stopped working. Praying it wasn't the actual Book itself, I discovered the cable had split and the copper wires had frayed and started to show where the cord met the plug. Freaking out about my possible 'lost' files including work for my business and our wedding photos, I looked around for a replacement adapter! Hoping that was the only problem. This is not made by WD at all but it actually worked like a dream (to my relief!)
to anyone who orders this as a replacement cord: the item works fine, but it is 18 inches shorter than the original k-tec cord that came with the western digital 1TB external hard drive
This power supply powered my WD3200H1U-00 My Book Essential as promised. The connector was a little snug to insert into the drive but I guess tighter is better than loose!
I have an old external WD hard drive that would not spin up. My first inclination was that the disk had gone bad. However, when I replaced the internal HD in that unit, it still would not spin up. I purchased this unit on a whim and boom, the HDs spun up again. Ever since, this has been powering the ext. HD just fine. It just works!More specifically:  The unit has a relatively small form factor in comparison to the one I was replacing.
My Western Digital external hard drive holds all my stuff - music, photos, documents. So when the AC power cord started to go bad, I needed a replacement fast. This one fits the bill perfectly. The drive sprang to life as soon as I got it plugged in. The cord appears to be much better insulated than the original. I hope it lasts a long time. The old one was about 3 years old.
Had a hard drive that wouldn't behave. Tracked it to the power supply. Placed an order for replacement. Back to normal. Textbook transaction! Lightning delivery/excellent pkging/quality product/A real PRO!
Answer: yes I had to buy one because the one that came with broke and this one did the job.