Question 1

What is the hd speed for this storage device? do they spin at 7500 rpm?

Accepted Answer

We'll need to clarify "speed" vs. rpm to answer the spirit of your question.
First, to answer one of the above commenters,- Having RAID doesn't alter the disk spin rate of each drive, and for the original poster the hard drive rpm speed is not necessarily directly tied to the ultimate "speed" you're thinking of, for general questions of speed you should be looking at the Data Read/Write speeds.  This unit does have RAID 0 setup out of the box with two 4TB WD Red 5400 rpm drives.  But the fact that it's 5400 rpm isn't because it's "cheapo" as mentioned above, it's a very deliberate decision on behalf of the product manufacturers, for very good reason.  
Most "NAS Certified" spinning hard drives, as the WD Red series is, are 5400 rpm, this is because NAS devices are generally always left on, so that any PC on the network can access the device when needed.  Using 5400 rpm drives in this way saves power consumption for each drive; it also keeps the radiant heat down coming off each and every drive in the NAS unit (this unit only has two hard drives but they can have any number of drives: 2, 4, 5, 8, 12, even more in high end units), so if you keep a unit like this on in your room or office it keeps the temperature of the room cooler; it also extends the life of each of the drives, slower spinning disks are proven to be less likely to run into issues than their faster spinning counterparts, and a longer life is CRITICALLY important given the use case of these drives as RAID enabled backup/storage destinations- 
     If RAID 1 is being used, the higher the drive failure rate, the more often you need to be reacting quickly to replace the failed drive, because the second a drive dies in a RAID array you're up against a clock of unknown time-limit counting down to the loss of your data, because if another drive dies before you replace the first and rebuild the array, you will lose all the data on the NAS (in most cases); 
     If RAID 0 is being used as is setup by default, you lose ALL the data the moment EITHER drive dies.  
So drive longevity is very important.

Beyond all those benefits, there's one very important reason to note regarding why it doesn't really negatively impact speed very noticeably when 5400 rpm drives are used- 
Drives used in a RAID array work as a team, and generally speaking the more drives in a RAID array the faster the read speed, because reads for each file are distributed across all of the spinning disks, meaning the 2 discs in RAID 0 only need to spin up to retrieve half the file each. 3 Discs? 1/3 the seek time (i'm oversimplifying but that's generally a good way to look at it).  Given these massive speed increases while working in parallel, any speed bottlenecks you may run into are just as likely to be due to any number of other interface areas.

TL;DR- 5400 rpm is GOOD for NAS devices! Increasing to 7200 rpm provides negligible data access speed increases, and could cause various long-term issues. If you need a drive speed increase nowadays you simply pay-up for SSD drives and live in luxury.

Question 2

Can this be used for mac

Accepted Answer

Yes. It is best to reformat if you will only be using it with a Mac.

Question 3

Can anyone comment on what bare drive is inside the enclosure?

Accepted Answer

I am 95% certain that the drive inside is a ASIN:B013HNYVCE WD Blue WD60EZRZ 5400rpm.The one I got is the 4TB, which is a ASIN:B013HNYV8I WD Blue WD40EZRZ 5400rpm.See my review: https://www.amazon.com/review/R388G5P0ACHROS

Question 4

Does this product have an international warranty?? Can I claim warranty for a product bought it U.S from India. Please advice.

Accepted Answer

no  international warranty

Brand	ウエスタンデジタル(Western Digital)
Product Dimensions	8.79 x 21.59 x 17.02 cm; 1.05 kg
Batteries	1 Lithium Ion batteries required.
Item model number	WDBBGB0060HBK-NESN
Is Discontinued By Manufacturer	No
Item dimensions W x H	8.8 x 21.6 x 17 cm
RAM Size	6 TB
Hard Drive Size	6 TB
Number of USB 2.0 Ports	1
Operating System	Windows 7, 8 and 10
Are Batteries Included	No
Lithium Battery Energy Content	7 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	30 g
Number Of Lithium Ion Cells	2
Item Weight	1.05 Kilograms

MY BOOK 6TB DESKTOP HARD DRIVE WITH PASSWORD PROTECTION AND AUTO BACKUP SOFTWARE

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