RAR Files

Multi-Part (Split) RAR Files Explained

A multi-part RAR archive splits one large compressed file into several smaller pieces that must all be present in one folder to extract correctly.

Multi-part, or multi-volume, RAR archives break a large archive into a series of smaller files instead of one big one. You'll see this with two common naming patterns: the newer archive.part1.rar, archive.part2.rar, archive.part3.rar scheme, or the older archive.rar, archive.r00, archive.r01 scheme.

Why archives get split

• Some upload platforms or email systems cap the size of a single file, so splitting a large archive lets it fit within that limit.
• Smaller individual files are easier to re-download individually if one transfer fails, instead of restarting a huge single download.
• Distributing large content across removable media or slow connections was historically easier in smaller chunks.

How to extract a multi-part archive correctly

1. 1Download every part into the same folderAll the .partN.rar (or .rNN) files need to sit together — extraction won't work with only some of them present.
2. 2Do not rename any of the part filesThe extractor identifies related volumes by their file names, so renaming a part can break the sequence.
3. 3Open only the first partThat's archive.part1.rar, or plain archive.rar in the older naming scheme — never start from .part2.rar or .r00.
4. 4Extract as normalThe extractor automatically reads through all subsequent parts in the folder to reconstruct the full archive.
5. 5Verify the extracted outputCheck that the extracted files and folders match what you'd expect from a complete archive.

Missing-part errors

What happens if a part is truly missing

Unlike a recovery record, which can patch small errors, a completely missing volume generally can't be reconstructed from the other parts alone — each part contains a distinct chunk of the compressed data stream. If a .rev recovery volume was provided alongside the set, it may be able to reconstruct one missing or damaged part; otherwise, you'll need to re-download the missing piece from the original source. See corrupted RAR file for related repair guidance.

How to Open a Multi-Part RAR Archive

Multi-part (or multi-volume) RAR archives split one large archive into smaller, fixed-size files, often to work around upload limits or make transfer easier. For background on why this splitting exists, see multi-part RAR files.

Keep all parts in one folder

Before extracting, make sure every volume of the set is downloaded and sitting in the same folder, with none renamed. Extraction tools locate the other volumes automatically based on the naming pattern and the folder they're in; a missing or misplaced file causes the extraction to stop partway through.

Two common naming patterns

Steps to extract

1. 1Confirm all volumes are presentCount the files against what you expect, or check the archive listing if you have one.
2. 2Right-click the first volume onlyThat's .part1.rar in the modern pattern, or plain .rar in the legacy pattern.
3. 3Choose Extract All or Extract HereThe tool automatically reads the remaining volumes from the same folder.
4. 4Verify the extracted outputConfirm the expected files and folders appear once extraction finishes.

Common mistakes

• Trying to extract a later part (like .part2.rar) directly, instead of the first volume.
• Downloading only some of the volumes.
• Renaming volume files, which breaks the pattern the extractor relies on to find the rest of the set.
• Mistaking several independent archives for one multi-part set — see extracting multiple RAR files at once for that distinction.

What Is a Multi-Volume RAR Archive?

Multi-volume archives, also called split archives or multi-part RAR files, exist because file size limits are common: email attachments, USB drives formatted with FAT32, upload limits on file-sharing sites, and older removable media all cap how large a single file can be. WinRAR solves this by splitting one logical archive into a series of numbered volumes.

• To fit under a file-size limit imposed by email, a website, or a storage device.
• To make transfer more manageable — smaller files can resume or retry more easily on a flaky connection.
• To distribute across multiple disks or drives when the total content is larger than any single one.

How volumes are named

See why RAR archives have .part1.rar files for more on this naming and which file to double-click.

Why every part is needed

A split archive is one continuous stream of compressed data cut into pieces — it is not several independent archives. Extraction reads the volumes in order and reassembles that stream, so if even one volume is missing or damaged, extraction stops or fails at that point. This is different from, say, a folder of separate ZIP files, where each file stands alone.

Recovery volumes

WinRAR can also create separate .rev recovery volumes alongside a split set. These aren't part of the data itself; they hold redundant information that can reconstruct one or more missing or damaged regular volumes, similar in concept to a RAR recovery record but spread across whole extra files instead of embedded in one archive.

Why RAR Archives Have .part1.rar Files

This naming scheme shows up whenever an archive is too large or was deliberately split into smaller chunks. RAR5 numbers the parts explicitly in the file name itself, which makes it obvious how many pieces there are and in what order they belong.

Split-set naming: old vs new

See RAR5 vs RAR4 for the broader differences between these two archive versions.

Which file to open

Always open .part1.rar (or, in the older scheme, the plain .rar file with no number). That's the volume that contains the archive's index and instructs the extractor to pull in the rest of the parts automatically, in order. If you try to open .part2.rar or later directly, most extractors will either refuse or prompt you for the missing earlier volume.

Why all parts are required

A split RAR archive is one continuous compressed data stream cut into separate files — it isn't a collection of independent archives. If .part2.rar is missing, extraction will get partway through and then stop, since the data that continues from that point simply isn't available. See multi-volume RAR archives for more on why this is, and RAR missing volume if you're actually missing a piece.

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