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About データ容量
Digital storage conversion has become increasingly important as data volumes grow exponentially. From measuring file sizes in kilobytes to managing petabytes of cloud storage, understanding data units is essential for anyone working with computers, smartphones, or the internet.
The basic unit of digital information is the bit (binary digit), which represents a single 0 or 1. Eight bits form one byte, the smallest addressable unit of memory. Data sizes scale in powers of two in binary systems (kibibytes, mebibytes) or powers of ten in the decimal system (kilobytes, megabytes), which can create confusion.
In the decimal system used by storage manufacturers, 1 KB equals 1,000 bytes, 1 MB equals 1,000,000 bytes, 1 GB equals 1,000,000,000 bytes, and 1 TB equals 1,000,000,000,000 bytes. In the binary system used by operating systems, 1 KiB equals 1,024 bytes, 1 MiB equals 1,048,576 bytes, and so on. This discrepancy explains why a 500 GB hard drive shows less capacity in your operating system.
Understanding these conversions helps with managing cloud storage plans, estimating download times, comparing file sizes, and making informed decisions about data management and backup strategies.
Frequently Asked Questions
Why does my 500 GB hard drive show less space in Windows?
Storage manufacturers use decimal units (1 GB equals 1,000,000,000 bytes), while Windows uses binary units (1 GiB equals 1,073,741,824 bytes). A 500 GB drive equals approximately 465.7 GiB in Windows. Additionally, some space is used by the file system and recovery partitions.
What is the difference between a megabyte and a mebibyte?
A megabyte (MB) equals 1,000,000 bytes in the decimal system, while a mebibyte (MiB) equals 1,048,576 bytes (2 to the power of 20) in the binary system. The difference is about 4.9 percent. The binary prefixes (KiB, MiB, GiB) were standardized by the IEC in 1998 to eliminate this ambiguity.
How much data can 1 GB hold?
Approximately 1 GB can hold about 200 to 250 photos, 230 songs at 128 kbps, or 500 e-books. For video, it holds about 5 to 10 minutes of standard definition or 2 to 3 minutes of HD video. Actual capacity varies depending on file quality and compression.
What comes after a terabyte?
After terabyte (TB) comes petabyte (PB, 1,024 TB), then exabyte (EB), zettabyte (ZB), and yottabyte (YB). As of 2025, the global datasphere is estimated to exceed 100 zettabytes, and large cloud providers manage exabytes of data.