Question 1

How many RPM?

Accepted Answer

I am 100% certain that the drive inside is 5400 RPM. The 4TB is a ASIN:B013HNYV8I WD Blue WD40EZRZ 5400rpm.See my review: https://www.amazon.com/review/R388G5P0ACHROS

Question 2

I did not realize this has a a/c power cord. does it require a/c power to work or will the usb power it?

Accepted Answer

I just setup my WD 10TB External Hard Drive yesterday as basically like a slave if you will and it works perfectly, lots of people will try to only connect it to the ac or some might try connecting to the 2.0 or 3.0 USP thinking more speed, the ac gives the speed better here, I have mine setup as an extra storage unit so don't want to see it near my Main hard drive in Devices, but it will set itself up a dozen times there also if you don't watch it close, so anyway I have the AC power cord plugged in that came with the External drive plus it is plugged into one of my USB slots if you will. I did have troubles with it trying to configure itself in my Windows 10 Desktop PC, and had to delete about a dozen extra bogus devices it named itself up as i.e. Ubee-DMS:10, then I formatted the 10TB storage unit, then unplugged from USB and restarted computer, then plugged back in the 10TB WD via usb into computer and PRESTO all worked as it was suppose to via the USB cables as a storage unit. When I Formatted the 10-TB WD AND IN DOING SO it Showed me it only had a capacity of 9.09TB and not the 10TB as the description showed I paid for, BUT 9TB or even 8TB would be just fine for me anyway.........

Question 3

my house has 210-240v european sockets , will this fit with normal adapter or will it burn out because it from america?

Accepted Answer

The Drives AFAIK are comfortable with 110v-240v. Im in Australia (240v) and seems to work fine. If you are concerned drop-in replacement adapters which have standard euro sockets (search mycartmax ebay) are about $8-10US, I would recommend a correct plug adapter anyway to avoid cheap international adapters. The price cannot be beaten (I study cryptography so go through a lot of drives) even adding in the cost of a replacement adapter the drive is a good buy.

Question 4

ok, stupid question, if i unplug the power cord with my data still be saved?

Accepted Answer

I think you are worried if you unplug the power cord is your data on the hard drive going to disappear permanently when you plug the power cord back?  If this is what you meant to ask yes the data will still be there if you saved the data and properly waited for it to write the data to the hard drive before unplugging the USB and power brick cable.  Do not turn off the power until either the data has been written or at least a minute has passed since any activity to the drive if you're really concerned.  The safest is to eject the USB drive from Windows and wait for it to say it is safe to unplug the device.  But since you can usually see the light flashing when it is reading or writing this will usually indicate it is safe to unplug.

ASIN	B01LQQHL4E
Additional Features	Hardware Encryption
Best Sellers Rank	#860 in Computers ( See Top 100 in Computers ) #9 in External Hard Drives
Brand	Western Digital
Built-In Media	Desktop hard drive^USB 3.0 cable^AC adapter^Quick Install Guide
Cache Memory Installed Size	4
Color	black
Compatible Devices	Laptop, PC
Connectivity Technology	USB
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (11,838)
Data Transfer Rate	5000 Megabits Per Second
Digital Storage Capacity	4 TB
Enclosure Material	plastic
Form Factor	3.5-inch
Global Trade Identification Number	00718037850788
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 Inches
Hard Disk Interface	USB 3.0
Hard-Drive Size	4 TB
Hardware Connectivity	USB 3.0
Hardware Platform	PC;Mac
Installation Type	External Hard Drive
Item Dimensions L x W x Thickness	21.6L x 17W x 8.8Th centimeters
Item Type Name	WD My Book USB 3.0 desktop hard drive and auto backup software,4 TB (WDBBGB0040HBK-NESN)
Item Weight	168 g
Manufacturer	Western Digital Technologies, Inc.
Media Speed	5000 megabits_per_second
Mfr Part Number	WDBBGB0040HBK-NESN
Model Name	My Book
Model Number	WDBBGB0040HBK-NESN
Number of Items	1
Read Speed	100 Megabytes Per Second
Specific Uses For Product	Personal
UPC	718037850788
Unit Count	1 Count

Western Digital 4 TB USB 3 My Book Desktop External Hard Drive - WDBBGB0040HBK-NESN

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