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Unable to see full amount of hard drive.
Issue

Unable to see full amount of hard drive.
Cause

Before explaining causes why a hard disk drive may not be detected fully, it is important to know that once setup it will not reach its full capacity. For example, if a 6 gig hard disk drive is installed in the computer, it may only see 5.9 GIG. If, however, a large portion of the hard drive is not being detected or seen, it is likely you may be experiencing any of the below possibilities.

    Limitation
    CMOS not setup properly
    Software / setup issue
    BIOS issue / limitation – hardware issue

Solution

Limitations

It is possible that the hard disk drive may not be seen because of a known limitation with the hardware or software. Below is a listing of known limitations and additional information / fixes about each of them. If you are not encountering any of the below issues, continue reading the other possible causes.

How much is 1 byte, kilobyte, megabyte, gigabyte, etc.?
Question

How much is 1 byte, kilobyte, megabyte, gigabyte, etc.?
Answer

Below is a listing of each of the commonly accepted disk drive space values. It is important to realize that not all manufacturers and developers use these values. For example, a manufacturer may consider a gigabyte as 1,000,000,000 and not 1,073,741,824 bytes, we’ve listed the commonly accepted values in their binary base 2 values.

Note: All values expressed below are whole numbers. This means that a GB may show that it can only contain one 650MB CD but in reality 1GB could hold 1.5753… of a 650MB CD. Since we’ve created this document to illustrate how much each value can contain in whole, no decimal values are shown. In other words you can only fit one complete 650MB CD on a 1GB drive since two 650MB complete discs would exceed 1GB.

Bit

A Bit is a value of either a 0 or 1.

Nibble

A Nibble is 4 bits.

Byte

A Byte is 8 bits.

Kilobyte (KB)

A Kilobyte is 1,024 bytes.

Megabyte (MB)

A Megabyte is 1,048,576 bytes or 1,024 Kilobytes

    873 pages of plaintext (1,200 characters)
    4 books (200 pages or 240,000 characters)

Gigabyte (GB)

A Gigabyte is 1,073,741,824 (230) bytes. 1,024 Megabytes, or 1,048,576 Kilobytes.

    894,784 pages of plaintext (1,200 characters)
    4,473 books (200 pages or 240,000 characters)
    341 digital pictures (with 3MB average file size)
    256 MP3 audio files (with 4MB average file size)
    1 650MB CD

Terabyte (TB)

A Terabyte is 1,099,511,627,776 (240) bytes, 1,024 Gigabytes, or 1,048,576 Megabytes.

    916,259,689 pages of plaintext (1,200 characters)
    4,581,298 books (200 pages or 240,000 characters)
    349,525 digital pictures (with 3MB average file size)
    262,144 MP3 audio files (with 4MB average file size)
    1,613 650MB CD’s
    233 4.38GB DVD’s
    40 25GB Blu-ray discs

Petabyte (PB)

A Petabyte is 1,125,899,906,842,624 (250) bytes, 1,024 Terabytes, or 1,048,576 Gigabytes.

    938,249,922,368 pages of plaintext (1,200 characters)
    4,691,249,611 books (200 pages or 240,000 characters)
    357,913,941 digital pictures (with 3MB average file size)
    268,435,456 MP3 audio files (with 4MB average file size)
    1,651,910 650MB CD’s
    239,400 4.38GB DVD’s
    41,943 25GB Blu-ray discs

Exabyte (EB)

A Exabyte is 1,152,921,504,606,846,976 (260) bytes, 1,024 Petabytes, or 1,048,576 Terabytes.

    960,767,920,505,705 pages of plaintext (1,200 characters)
    4,803,839,602,528 books (200 pages or 240,000 characters)
    366,503,875,925 digital pictures (with 3MB average file size)
    274,877,906,944 MP3 audio files (with 4MB average file size)
    1,691,556,350 650MB CD’s
    245,146,535 4.38GB DVD’s
    42,949,672 25GB Blu-ray discs

Zettabyte (ZB)

A Zettabyte is 1,180,591,620,717,411,303,424 (270) bytes, 1,024 Exabytes, or 1,048,576 Petabytes.

    983,826,350,597,842,752 pages of plaintext (1,200 characters)
    4,919,131,752,989,213 books (200 pages or 240,000 characters)
    375,299,968,947,541 digital pictures (with 3MB average file size)
    281,474,976,710,656 MP3 audio files (with 4MB average file size)
    1,732,153,702,834 650MB CD’s
    251,030,052,003 4.38GB DVD’s
    43,980,465,111 25GB Blu-ray discs

Yottabyte (YB)

A Yottabyte is 1,208,925,819,614,629,174,706,176 (280) bytes, 1,024 Zettabytes, or 1,048,576 Exabytes.

    1,007,438,183,012,190,978,921 pages of plaintext (1,200 characters)
    5,037,190,915,060,954,894 books (200 pages or 240,000 characters)
    384,307,168,202,282,325 digital pictures (with 3MB average file size)
    288,230,376,151,711,744 MP3 audio files (with 4MB average file size)
    1,773,725,391,702,841 650MB CD’s
    257,054,773,251,740 4.38GB DVD’s
    45,035,996,273,704 25GB Blu-ray discs

CD-ROM drive is not the D: drive.
Issue

CD-ROM drive is not the D: drive
Cause

Another drive or partition has been added to the computer.
Solution

When another peripheral is installed into the computer, the CD-ROM will automatically be defaulted as the last drive in Microsoft operating systems. For example, if your CD-ROM, DVD or other disc drive was the D: drive and you’ve added a new hard drive to the computer your disc drive will now be the E: drive.

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