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2. df (Unix) - Wikipedia

   en.wikipedia.org/wiki/Df_(Unix)

   Write the amount of free space of the file system containing the specified file Most implementations of df in Unix and Unix-like operating systems include extra options. The BSD and GNU coreutils versions include -h , which lists free space in human readable format displaying units with the appropriate SI prefix (e.g. 10 MB [ 5 ] ), -i , which ...

3. du (Unix) - Wikipedia

   en.wikipedia.org/wiki/Du_(Unix)

   du (abbreviated from disk usage) is a standard Unix program used to estimate file space usage—space used under a particular directory or files on a file system. A Windows commandline version of this program is part of Sysinternals suite by Mark Russinovich .

4. Btrfs - Wikipedia

   en.wikipedia.org/wiki/Btrfs

   Deleting this sparse file frees up the space and makes the conversion permanent. [67] In 4.x versions of the mainline Linux kernel, the in-place ext3/4 conversion was considered untested and rarely used. [67] However, the feature was rewritten from scratch in 2016 for btrfs-progs 4.6. [47] and has been considered stable since then.

5. Free-space bitmap - Wikipedia

   en.wikipedia.org/wiki/Free-space_bitmap

   A separate array then stores the number of free sectors in each chunk, so chunks with insufficient space can be easily skipped over, and the total amount of free space is easier to compute. Finding free space now entails searching the summary array first, then searching the associated bitmap chunk for the exact sectors available. [1]

6. Memory paging - Wikipedia

   en.wikipedia.org/wiki/Memory_paging

   The Linux kernel supports a virtually unlimited number of swap backends (devices or files), and also supports assignment of backend priorities. When the kernel swaps pages out of physical memory, it uses the highest-priority backend with available free space.

7. Trim (computing) - Wikipedia

   en.wikipedia.org/wiki/Trim_(computing)

   The support for TRIM also varies by what the particular filesystem driver on the operating system is capable of, since only a program with an understanding of what parts of the disk are free space can safely issue the command, and on the system level this ability tends to lie in the filesystem driver itself.

8. F2FS - Wikipedia

   en.wikipedia.org/wiki/F2FS

   F2FS (Flash-Friendly File System) is a flash file system initially developed by Samsung Electronics for the Linux kernel. [ 5 ] The motive for F2FS was to build a file system that, from the start, takes into account the characteristics of NAND flash memory -based storage devices (such as solid-state disks , eMMC , and SD cards), which are ...

9. List of data-erasing software - Wikipedia

   en.wikipedia.org/wiki/List_of_data-erasing_software

   Linux: Yes internal [9] not directly supported without scripting nwipe: Martijn van Brummelen GNU GPL v2: Linux: Yes external Yes Parted_Magic: Patrick Verner, Parted Magic LLC uses mostly GPL components with published source, a few proprietary components, and fee for media/download [10] [11] OS independent, based on Slackware Linux: Yes ...