Solved

Data Transfer Speed

Posted on 2006-10-26
2
212 Views
Last Modified: 2010-04-25
I want to buy an external HDD.
I want to know which is faster the USB 2.0 or Ethernet 100?
How time is necessary therorical to transfer 1 GB in each one?
0
Comment
Question by:cpx_Support
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 92

Assisted Solution

by:nobus
nobus earned 75 total points
ID: 17810058
usb 2.0 = 480 Mb / sec   --> 1 gb= 1000 mb / 480 = 2.x
Ethernet  100 = 100 Mb / sec  -->   1gb / 100 = 10

more info :  
http://www.everythingusb.com/usb2/faq.htm
http://nl.wikipedia.org/wiki/Universal_Serial_Bus
0
 
LVL 70

Accepted Solution

by:
garycase earned 175 total points
ID: 17824469
The calculations above are not correct.  The data rates are stated in megaBITS per second;  but a GB is a gigaBYTE.   So, although the RELATIVE speeds are correct (i.e. the USB connection is faster), the times are not.   Roughly speaking, the BYTE/sec rate is 1/10th of the bits/sec rate (the actual relationship depends on the packet sizes, but that's fairly close) ==> so the maximum data rates are 48MB/sec and 10MB/sec, respectively.   The actual rate achieved also depends on how much contention there is on the lines => i.e. how many network or USB devices are connected and active.

So, although the USB connection is theoretically 4.8X the 100BaseTX ethernet, the actual relationship will probably be somewhat less different.   Further, most drives cannot sustain transfers at the USB maximum rate except on the outer cylinders.

The FASTEST connection for an external drive is eSATA => you'll get full SATA transfer rates for the buffered data and can maintain the full sustained transfer rate that the drive is capable of.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Many people don't really know what the difference is between memory and storage. And most regular users don't understand the relationship between any of those fancy words printed on the front of their new computer. Of course, it's perfectly fine -- …
Like many organizations, your foray into cloud computing may have started with an ancillary or security service, like email spam and virus protection. For some, the first or second step into the cloud was moving email off-premise. For others, a clou…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question