Calculating Bit-Density of a CD using AFM Images

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In summary, the conversation discusses the process of determining the bit-density of a CD using AFM images and manual counting. The total active area of the disc is calculated to be 9,085µm^2, while the inner inactive area is found to be 1,661µm^2. The next step is to calculate the total number of bits, but the result seems incorrect as it would mean the CD has only 0.00215640640258789MB of storage. A discrepancy is noted with the radius measurement of 58.5µm and the overall area calculation.
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SarahBoberra
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We took AFM images of a CD in lab. Manual counting provided that there were 224 bits in the 900µm^2 image I have. Based on this I want to determine the bit-density of the whole CD.

The total active area for the disc is the total area minus the inner inactive are of the disc. The total area was calculated using a radius of 58.5µm and was found to be 10,746 µm^2. The inner inactive area of the disc was found to be 1,661µm^2. Therefore, the total active area of the disk was 9,085µm^2.

Shouldn't the next step be to take (224 bits/900µm^2)*9,085µm^2 to get the total number of bits? For this I get 2,261.156 bits, but it can't be right because it would mean that the whole CD had only 0.00215640640258789MB of storage! I know that CDs have ~650MB of storage. What did I do wrong? Please?
 
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  • #2
Radius of 58.5µm doesn't look correct to me. Are you sure you mean µm?
 
  • #3
the area looks waaaay off!
 

FAQ: Calculating Bit-Density of a CD using AFM Images

What is AFM Bit-Density Calculation?

AFM Bit-Density Calculation is a process used in atomic force microscopy (AFM) to measure the density of bits on a data storage device, such as a hard drive. It involves analyzing the surface topography of the device and calculating the number of bits per unit area.

Why is AFM Bit-Density Calculation important?

AFM Bit-Density Calculation is important because it allows for accurate measurement and evaluation of data storage devices. This information is critical for the development and improvement of storage technology, as well as for quality control in manufacturing.

How is AFM Bit-Density Calculation performed?

AFM Bit-Density Calculation involves scanning the surface of the data storage device with a small probe, which measures the distance between the tip of the probe and the surface. This data is then analyzed using specialized software to calculate the bit density.

What factors can affect the accuracy of AFM Bit-Density Calculation?

The accuracy of AFM Bit-Density Calculation can be affected by various factors, such as the size and shape of the data storage device, the type of probe used, and the scanning parameters. It is important to carefully control these variables to ensure accurate results.

How is AFM Bit-Density Calculation used in research and development?

AFM Bit-Density Calculation is a valuable tool in research and development for data storage technology. It allows for the evaluation and comparison of different storage devices, as well as the identification of areas for improvement. It is also used in the development of new storage materials and techniques to optimize bit density and increase storage capacity.

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