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QMEFS (Quantum Meadows ETERNAL File System) is a 256-bit flexible file system designed to be the ultimate file system. It is also the default file system of the qMeadows operating system.

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seanpm2001/QMEFS

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QMEFS (Quantum Meadows ETERNAL File System)

proposal for a perfect file system

Version 3 (2022, Tuesday, August 23rd at 4:40 pm)

Simplified overview

Capacity: 115.792 Quattuorvigintillion bits (14.474 Quattuorvigintillion bytes) or 2^256 bytes

Bit type: 256 (256 bit, is able to run on 128 bit or higher devices)

Date range: The beginning of time (the start of the Big Bang, or ~13,787,000,000 BCE) to as far as the 256 bit integer can go from there in planck seconds

Allowed characters: All, except for /

Mode: Switchable with commands, default is COW (Copy-On-Write)

Max files per directory: 340,282,366,920,938,463,463,374,607,431,768,211,455 or 2^128

Max number of directories: 340,282,366,920,938,463,463,374,607,431,768,211,455 or 2^128

Max file size per file: 340,282,366,920,938,463,463,374,607,431,768,211,455 bytes or 2^128

Reference to names of large numbers: CSV table

Full specification

Variable Conditions
Maximum capacity (yottabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000,000,000,000,000,000 Yottabytes
Maximum capacity (zettabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000,000,000,000,000 Zettabytes
Maximum capacity (exabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000,000,000,000 Exabytes
Maximum capacity (petabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000,000,000 Petabytes
Maximum capacity (terabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000,000 Terabytes
Maximum capacity (gigabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000,000 Gigabytes
Maximum capacity (megabytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000,000 Megabytes
Maximum capacity (kilobytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8,000 Kilobytes
Maximum capacity (bytes): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 / 8 bytes
Maximum capacity (bits): 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 bits
Word size: 256 bit
Allowed characters: All except for one
Disallowed characters: /
Default date format: YYYY/MM/DD
Date start: ~13,787,000,000 BCE
Date end: Unknown, at least 312,000,000,000,000 CE
Date range: 115,​792,​089,​237,​316,​195,​423,​570,​985,​008,​687,​907,​853,​269,​984,​665,​640,​564,​039,​457,​584,​007,​913,​129,​639,​935 planck seconds
External device support: True
Internal device support: True
Default date resolution: Planck seconds
Secondary date resolution: Nanoseconds
Deduplication: Optional (not enabled by default)
Unicode: Supports any version of Unicode
Max files per directory: 340,282,366,920,938,463,463,374,607,431,768,211,455
Max number of directories: 340,282,366,920,938,463,463,374,607,431,768,211,455
Max file size per file: 340,282,366,920,938,463,463,374,607,431,768,211,455 bytes
Maximum file path: 2,147,483,647 ASCII characters per line
Other specs: Unlisted/coming soon
Mode 1: Copy-on-Write (COW)
Mode 2: Read only
Mode 3: Unspecified
Mode 4: Unspecified
Tree 1: B-Tree
Tree 2: Unspecified
RAID support: Unknown
Hard Disk Drive support: False
Solid State Drive support: True
Tape Drive support: Unspecified
Flash memory support: True
Drive compression: Optional (disabled by default)
Data encryption: True (disabled by default)
Supported encryption types: Unknown
Compatible hardware: DeciCube, Other/unknown

Credits

Creator: @seanpm2001

Inspirations:

  • OpenZFS
  • NTFS
  • ext4
  • Btrfs

Clarifications

  • ETERNAL is NOT a misspelling of External. The file system supports both internal and external drives, and also is meant to last an eternity.

  • A 128 bit or better processor is required to operate the file system, a 256 bit processor isn't required, but is recommended. The file system cannot run on 127 bits or lower, which includes 64 bit, 32 bit, 16 bit, 8 bit, etc.

  • This file system is designed for the QMeadows operating system, but can run on other Linux distributions once you add support for it

  • Some people don't say the FS line when referring to a file system by name. On 2022, August 23rd, I escaped confusion regarding Btrfs being referred to as BTR, which originally made me think BTR and BTRFS were 2 different file systems, which led to major confusion when I couldn't find anything on the BTR file system, which doesn't exist. When referring to QMEFS, please also mention the FS part of the name to avoid confusion.

In short, Don't refer to it as QME or QM


File info

Click/tap here to expand/collapse this section

File type: Markdown (*.md *.mkd *.mdown *.markdown)

File version: 2 (2022, Tuesday, August 23rd at 4:40 pm PST)

Line count (including blank lines and compiler line): 168

Current article language: English (EN_USA) / Markdown (CommonMark) / HTML5 (HyperText Markup Language 5.3)

Encoding: UTF-8 (Emoji 12.0 or higher recommended)

All times are UTC-7 (PDT/Pacific Time) (Please also account for DST (Daylight Savings Time) for older/newer entries up until it is abolished/no longer followed)

Note that on 2022, Sunday, March 13th at 2:00 am PST, the time jumped ahead 1 hour to 3:00 am.

You may need special rendering support for the <details> HTML tag being used in this document


File history

Click/tap here to expand/collapse the file history section for this project

Version 1 (2022, Monday, August 22nd at 1:21 pm PST)

This version was made by: @seanpm2001

Changes:

  • Started the file
  • Added the title section
  • Added the main table
  • Added the Credits section
    • Added the Inspirations subsection
  • Added the file info section
  • Added the file history section
  • No other changes in version 1

Version 2 (2022, Tuesday, August 23rd at 4:40 pm PST)

This version was made by: @seanpm2001

Changes:

  • Updated the title section
  • Added the Simplified overview section
  • Renamed the main table section to the Full specification section
    • Updated the main table
  • Added the Clarifications subsection
  • Updated the file info section
  • Updated the file history section
  • No other changes in version 2