1. Disk physical composition:
Disc robot arm (head) of the spindle motor
Cylinder sector
Disk partition table MBR (old stupid) GPT
/ Dev / sda [1-128] physical disk file name / dev / vda [1-128] virtual disk file name
After partition formatting reason: Each operating system used by the file system is not the same as win98-FAT win2000-NTFS Linux-ext2 and other general U disk formatted with FAT
Linux systems for super block block: recording information on this overall system, including the total amount of the inode data block, the amount of the remaining amount, and the file system format related information
inode: Record file attributes of a file occupies one inode, colleagues recorded data block number where this file
Data block: The actual contents of the log file, if the file is too large, will take up multiple blocks
Defragmentation: The reason; file write too discrete blocks, file read performance deteriorates indexed file systems generally do not do not need to defragment
2.linux ext2 file system introduced (now ext4)