The Ext2/3 Filesystems

The Ext2/3 filesystems are (unsurprisingly) of the FFS/UFS family. Important data is kept in duplicate in superblocks scattered around the filesystem, so that if the main superblock is ever inaccessible or corrupted, emergency copies are still available to parse the filesystem. (Back in the day, we also thought that such redundant copies could make for faster reads since back then we actually had some idea of disk geometries, but of course nowadays we don't know anything about the physical layout of spinning drives, and such considerations are not even relevant to SSDs.)



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* help? contents? restart?Florida State University, 2018