All OS MicroSD Card Speed Query

Phenomenal

Disciple
Hi,
I got a Sandisk MicroSD Card 8GB Class 4 replaced through RMA.
Link : http://www.flipkart.com/sandisk-microsd-card-8-gb-class-4/p/itmeyfrqxfftnhcs
But the transfer speed from PC to Phone was just 512KB/s avg and 768KB/s max.
Tried both via USB Cable and a USB-based adaptor.
Is this common?
In the reviews most people mention write speeds anywhere between 2-7 MB/s.
It also says 4MB/s here : https://www.sdcard.org/developers/overview/speed_class/
Do they all mean Mb/s or is something wrong with my card?
 
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