A Cheap NAS with 3TB Installed Sold by Amazon Officially

(Updated on 2018 May 11: We received the email from Amazon which notified us this item’s price was incorrect, our order was cancelled. )

We just ordered a cheap 3TB hard drive pre-installed NAS which is sold by Amazon officially. The price is crazy for $28.89 CAD.

Even it is temporarily out of stock, but we can still order it because Amazon mentions “Order now and we’ll deliver when available. We’ll e-mail you with an estimated delivery date as soon as we have more information. Your account will only be charged when we ship the item.”

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Be Smart enough to Recognize TB vs Tb GB vs Gb MB vs Mb KB vs Kb

We often see the texts TB, Tb, GB, Gb, MB, Mb, KB, Kb from common electronic products’ feature description. For example, when we buy an External Hard Drive, we see its size like xxx MB or xxx GB; or when we buy a SSD drive or a Macro SD card, we see their speed like xxx Gb/s or xxx Mb/s.

What Mistakes do People Often Make ?

Consumers might not realize that they are easily silly to ignore some important technical description from the items package or related web page. Those technical descriptions actually expose important information to us. For example, the technical data units. But do you really understand them?

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There are three popular types of SD memory card. Normally we can see those cards come with the text labels like SD, SDHC or SDXC. sometimes we see SDSC.

So what are they?

Actually they indicate the card’s storage capacities.

1: SD:

SD actually is Secure Digital. It is earlier age SD card, the default format is FAT16 and capacities range is from 128MB to 2GB.


Continue reading “SD vs SDHC vs SDXC”

How big the digital size is?

Before our disk storage size was 360KB, 720KB, 1.44MB… etc., later we used XXX MB, GB, currently the popular size unit is TB, so what will be after TB ? How big the digital size can be?

The following is all size unit which we can collect:


Symbol Value Binary
kilobyte (kB) 103 210
gigabyte (GB) 109 230
terabyte (TB) 1012 240
petabyte (PB) 1015 250
exabyte (EB) 1018 260
zettabyte (ZB) 1021 270
yottabyte (YB) 1024 280