Sat. Jun 22nd, 2024

Blu-ray Discs come in various types, each suited for different purposes, which can be somewhat confusing. In this discussion, we will explain the differences between BD-R and BD-RE, and introduce other types of Blu-ray Discs, clarifying when and how to use each one.

What is a Blu-ray Disc?

A Blu-ray Disc (BD) is a next-generation optical disc format that succeeds the DVD, capable of storing high-quality audio and video files as well as large amounts of data. Sony was the first company to develop and research Blu-ray Discs (BD).

Blu-ray Discs come in capacities of 25GB and 27GB, allowing up to 4 hours of high-definition film to be recorded. There are also dual-layer discs with capacities of 46GB and 54GB, supporting up to 8 hours of high-definition film. Larger capacities include 100GB and 200GB, available in four-layer and eight-layer formats, respectively.

It is important to note that Blu-ray Discs need to be played on a Blu-ray player. While Blu-ray players can play regular DVDs, DVD players can only play DVDs and CDs, and cannot play Blu-ray Discs.

Differences between BD-R and BD-RE

There are three types of Blu-ray Discs: BD-R, BD-RE, and BD-ROM. Here, we will explain the differences between BD-R and BD-RE in detail.

BD-R: Write Once

BD-R is a type of Blu-ray Disc that can be written to only once, available in single-layer or dual-layer formats. It allows data to be read and written but cannot be overwritten. However, if there is remaining space, additional data can be appended.

Since BD-R can only be written once, it is ideal for permanently storing important data such as family photos or crucial documents. BD-R products are available in “1-4x” or “1-6x” writing speeds.

Additionally, BD-R comes in capacities like BD-R DL (dual-layer 50GB) and BD-R XL (triple-layer 100GB).

BD-RE: Rewritable

Unlike BD-R, BD-RE can be written and rewritten multiple times. You can erase and overwrite the contents. However, the number of rewrites is limited to approximately 1,000 to 10,000 times. This is generally sufficient for most users’ needs, making it nearly unlimited. The writing speed for BD-RE is “1-2x,” which is slower than BD-R.

BD-RE is suitable for storing data or information that needs frequent updating, such as current videos or TV shows that might be replaced dirpy 使えない later. For this purpose, BD-RE is recommended.

BD-RE also comes in capacities like BD-RE DL (dual-layer 50GB) and BD-RE XL (triple-layer 100GB).

Other Types and Uses of Blu-ray Discs

Apart from BD-R and BD-RE, there is also BD-ROM. BD-ROM (Blu-ray Disc Read-Only Memory) is a read-only Blu-ray Disc for storing large amounts of data. It is used for recording HD movies or game software. BD-ROMs are read-only and cannot be rewritten. They come in single-layer (25GB) and dual-layer (50GB) formats, with a standard read speed of 54Mbps (1.5x).

Prices of Blu-ray Discs: BD-R, BD-RE, and BD-ROM

How much do different types of Blu-ray Discs cost? The price depends on the disc capacity and functionality. Although Blu-ray Discs are categorized for video or data use, the price difference is minimal. Prices vary significantly based on the recording method. Generally, BD-RE (around 2,838 yen) is more expensive than BD-R (around 1,212 yen).

Prices also increase with capacity: XL (triple-layer 100GB), DL (dual-layer 50GB), and SL (single-layer 25GB). Purchasing discs in sets is more economical than buying them individually, so consider bulk buying for cost savings.

Converting Blu-ray Discs to MP4 with DVDFab Blu-ray Ripper

As mentioned, Blu-ray Discs require a Blu-ray player, which can be inconvenient. Converting Blu-ray Disc contents to MP4 format allows for easy playback on various devices.

To convert Blu-ray Discs to MP4, we recommend DVDFab Blu-ray Ripper, a tool by DVDFab compatible with both Windows and Mac OS. Even beginners can easily use this tool to convert formats. A free version is available, with a 30-day trial for the full features.

How to Use DVDFab Blu-ray Ripper:

  1. Download DVDFab Blu-ray Ripper from the official website by clicking “Free Download.”
  2. Select the appropriate version for your Mac. For Macs before 2022, choose the Intel chip version.
  3. Once downloaded, follow the installation instructions.
  4. Open the DVDFab Blu-ray Ripper main screen and click “Ripping.” Insert the disc you want to convert, or drag and drop the video file.
  5. Select MP4 as the output format and click “Yes” to start the conversion. The software will automatically convert the disc or video contents to MP4 format.


This article explained the different types of Blu-ray Discs (BD-R, BD-RE, and BD-ROM), their features, and the appropriate ブルーレイ mp4 変換 無料 uses for each type. For those confused about Blu-ray Discs, this article should clarify the distinctions. Additionally, we introduced a method to overcome the limitations of Blu-ray Discs by converting them to MP4 using DVDFab Blu-ray Ripper, a user-friendly and free software tool.

Blu-ray Discs come in several types, each suitable for different uses. BD-R (write-once) is ideal for permanently storing important data, such as family photos or crucial documents. BD-RE (rewritable) can be written and rewritten multiple times, making it perfect for frequently updated content like videos or TV shows. Other types include BD-ROM, which is read-only and used for storing HD movies and game software. Understanding these distinctions helps in selecting the appropriate Blu-ray Disc for specific needs. Additionally, converting Blu-ray Discs to MP4 using tools like DVDFab Blu-ray Ripper can make playback more


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