Data Transfer Time Question

pro11

Hello everyone,

Decided to go get my CCENT cert (100-105) and currently going through the CBT nuggets videos by Jeremy.
In the Network Fundamentals: Speed, Data Size and Diagrams video he explains how to calculate your data transfer speed using the file size and connection speed.
To assist me in this task I am using a site Jeremy referenced during the video: [URL="http://CalcTool: Data Transfer"]http://www.calctool.org/CALC/prof/computing/transfer_time[/URL]

In his example:
8 MB file > 100 Mbps (connections speed) = Should take 0.610352 s

Just to practice I found an excel file in my computer with a file size of 25.2 KB.
25.2 KB > 100 Mbps (connections speed) = should take 0.00192261 s according to the site mentioned above.
I tried to complete the calculation manually just to have a better understanding of it and was not able to use Jeremy's calculation, due to the different units (MB and KB).
So here's what I did:
25.2 KB /1024 = 0.0246 B
0.246 B * 8 b = 0.00196875 b
0.196875 b / 100 mbps = 0.00196875 s (the transfer time calculation tool spits out 0.00192261 s, which is only obtained by dividing by 102.4 mbps instead of 100 mbps)

I may be giving this too much importance but just want to make sure I have the correct understanding of it.
Is there an easier way of doing this calculation?

Regards

dontstop

Set your data size to KiB instead of KB in the calculator app. Otherwise it will be dividing 25.2 / 1000 and not 1024.

KiB = 2^10 bytes [1024 bytes]
KB = 10^3 bytes [1000 bytes]

Windows will show a file size of 1KB but on disk from my understanding it's actually 1KiB (so the file will have 1024 bits)

For instance I just made a file in Notepad++ with 1024 characters (8 bits each) and Windows reports "1.00 KB (1,024 bytes)" to be correct it should report based on today's conventions "1.00 KiB (1,024 bytes)".