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How To: Make a USB Read Only

There are two ways to make a USB stick read only. One way is a universal solution and is 100% permanent, the other way is PC specific and a good deterrent. When we say 100% permanent, this means the USB stick is read only (write protected) on all computers, whether it be a Mac, PC, Linux, etc type computer, the USB is read only and the status cannot be changed. The other method flags a USB device to be read only in relationship to the PC it is connected to so that whenever that USB stick is connected to that computer, it makes the USB read only and blocks all write commands to the device.

Most times an IT manager or content owner wants the USB stick to be read only so the files cannot be deleted or formatted off the drive. Another reason for making a USB read only is for the original files to remain the same and blocks the ability for files to be changed or manipulated. Finally, it’s smart to have USBs read only so that virus’ don’t jump onto the drive and possibly spread to other computers.

Let us start with the less permanent way because it’s easier to do and doesn’t require any specific hardware. You will need a Windows7 machine or higher. The Windows7 machine will have DiskPart utility which allows us to perform all sorts of cool things to flash drives, like setting write protection.

  • Connect the USB to your Windows computer.
  • To begin, go to your Windows Start and in the Search Field type “cmd”

This will run your Command prompt.

  • Next, you will want to get to the C root of the Command prompt and if you are signed in as a user you can simply type cd\ this will get you back to the root of the C drive.
  • Type DISKPART
  • Type LIST DISK

Now you will need to find the USB stick connected to your PC. Most likely it’s DISK 1

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How Flash Memory Works

This is a great video that explains how flash memory works. Granted, the video is very technical but does work through the concept of reading and writing data to flash. So if you have the 17 minutes to use, I suggest giving this a watch. The video does cover SLC, MLC and TLC memory and how each of these technologies read and write with the different layers of a floating gate device like NAND. Source: YouTube. Continue Reading

Question: CRC Verse Checksum Verification for USB Flash Drives?

Is Checksum or CRC better for checking data written to USB flash drives?

This post is to give the general user an idea of what verification method is better for writing data to a flash drive.  There are reference links at the bottom of this post which dive much deeper into the two methods of verification if this simple overview is not enough.

The short answer is Cyclical Redundancy Check or CRC is the best method for checking data written to a USB flash drive.

Many believe a checksum is the best method to verify data written to a flash drive (most popular is MD5).  I believe this is favored because it is easier to understand how the verification works, and also easier to implement.  However, there are flaws in checksum verification and therefore not suitable for verification of data written to a flash drive.

What is the difference between Checksum and CRC verification?  The checksum method uses addition in its math calculations to check whether all data was written correctly.  CRC uses long division in its math calculations to check whether all data was written correctly.  It is worth noting I am talking about binary long division, not the school-yard long division you so fondly remember.

Checksum methods will calculate the total bits in a packet of data and include that total checksum amount when the data is sent over communication lines.  The receiver will then look at the packet, read the checksum value and then perform the same calculation to make sure everything adds up.  If the calculation on the receiver’s end matches the value passed in the packet, all is good.  The problem is a high probability that somewhere between the sender and receiver the bits of data are changed, corrupted or swapped yet still turn a correct checksum value after calculation on the receiving end.

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How To: Minecraft on USB Stick

Minecraft has taken on a life of it’s own. From 5 year old kids being obsessed with Minecraft to adults making movie trailers it’s a strange little obsession for digital lego’s that look like CAD drawings. Either way, you might find this post useful for how to make a portable Minecraft USB stick. With a portable version of Minecraft you can now play the game anywhere, school, library, work, you name it. This is how you do it: (Download Portable Minecaft rar now)
  1. Download portabal_minecraft.rar
  2. Extract Minecraft folder to Memory stick  *Need program to extract .rar file, just Google “extract rar”
  3. Open the Run.exe
  4. Log into your Minecraft account and let it update for you
  5. That’s it!
The resultant USB will have several items in the root of the USB.
  • .minecraft folder with all your assets
  • Minecraft exe file which is the program
  • Start.bin file, which generates Minecaft when you start
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Tech Hack: Alesis IO Dock with USB Hub

The Alesis IO Dock is a great product for iPad musicians – this small hack makes it even greater. It overcomes one limitation of the IO Dock: You can’t simply hook it to a USB hub. So I decided to build in an additional hub – which allows me to hook up additional class-compliant interfaces like my M-Audio Axiom master keyboard, and power them via the hub. Yes, it works. No, it hasn’t been thoroughly tested yet. So try at your own risk. Full Tutorial (nice) Continue Reading

3D Printed Web Camera Controller

Instructables member TLevis posted a cool tutorial on making a webcam controller from a 3D printer.  Since 3D printers are all the rage right now, lets spread the word.  It’s a cool design, but overlooks the ability to move the camera up and down…as it only rotates left and right. Read up on the tutorial via Instructables. Continue Reading

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