Calculating Data Storage

flashdrive

mutimedia memory card

digital versatile disc

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external hard disk drive

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Multiple Choice

1) If a 10 KB file is stored in a 1 MB folder, then approximately how many files can be stored in that folder?

• 101 Files

• 102 Files

• 103 Files

• 104 Files

​CALCULATING DATA STORAGE​

While a bit is the smallest representation of data, the most basic unit of digital storage is the byte. A byte is 8 bits and is the smallest unit of measure (UOM) used to represent data storage capacity. When referring to storage space, we use the terms bytes (B), kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB).

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CALCULATING DATA STORAGE

​One kilobyte is a little more than one thousand bytes,

specifically 1,024.

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A megabyte represents more than a million bytes or 1,048,576.

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A gigabyte is 1,073,741,824 bytes.

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A terabyte is 1,099,511,627,776.

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The exact number is gained by taking 2^n power.

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CALCULATING DATA STORAGE

In general, when something is represented digitally, the greater the detail, the greater the number of bits needed to represent it. A low-resolution picture from a digital camera will use around 360KB, and a high-resolution picture could use 2 MB or more.

​ Kilobytes, megabytes, gigabytes, and terabytes are typically used to measure the size or storage capacity of a device. Examples of components and devices that use byte storage include: random access memory (RAM), hard disk drive space, CDs, DVDs, and MP3 players.

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CALCULATING DATA STORAGE

CDs have a data storage capacity of approximately 700 MB. DVDs have a data storage capacity of approximately 4.3 GB on a single-layer disc, and approximately 8.5 GB on a dual-layer disc. BDs have a storage capacity of 25 GB on a single-layer disc, and 50 GB on a dual-layer disc.

​Once we know the size of a file or folder, it is possible to determine the number of bytes being used. For example:

​A file is 20 KB in size​

1 KB = 1,024 Bytes​

20 * 1,024 = 20,480 bytes in a 20 KB folder​

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CALCULATING DATA STORAGE

If a 20 KB file is stored in a 1 MB folder (1 MB = 1,048,576 bytes of space); then approximately a total of 51 files can be stored in that folder (1,048,576 / 20,480 = 51.2).

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Multiple Choice

1. How many 60 KB jpg files can be stored on a 2 MB folder in your hard drive?

• 341 files

• 340 files

Multiple Choice

2. How many 5 MB mp3 files can be stored on a 1 GB flash drive?

• 204 files

• 205 files

Multiple Choice

3. How many 750 MB avi files can be stored on a 4.3 GB DVD-R?

• 6 avi files

• 5 avi files

Open Ended

1.   Why would storage devices be handled with extra care?

Open Ended

2.   Which do you prefer to use; CD, DVD, or BD? Why?