df seems to show information that does not add up. Available + used != total. This seems to be more noticable the larger the drive. /dev/sdd shows almost 2 gigs missing. ----------------Example------------------ Filesystem 1k-blocks Used Available Use% Mounted on /dev/sda6 4633076 157824 4239904 4% / none 0 0 0 - /proc usbdevfs 0 0 0 - /proc/bus/usb /dev/sda2 23333 11977 10152 55% /boot /dev/sda5 9218620 2123344 6626984 25% /usr /dev/sdb1 17496684 20 16607872 1% /usr2 /dev/sdc1 17496684 20 16607872 1% /usr3 /dev/sdd1 35001508 20 33223496 1% /usr4 none 0 0 0 - /dev/pts /dev/sda1 3099260 1404 2940424 1% /home automount(pid534) 0 0 0 - /misc --------------------End------------------- ----------------Start /proc/partitions------------ major minor #blocks name rio rmerge rsect ruse wio wmerge wsect wuse running use aveq 8 0 17783239 sda 2137 6812 68448 12630 1031 160 9480 35530 0 11520 48160 8 1 3148708 sda1 11 3 46 60 1 0 8 0 0 60 60 8 2 24097 sda2 24 477 1002 200 5 3 16 40 0 240 240 8 3 1 sda3 0 0 0 0 0 0 0 0 0 0 0 8 5 9365863 sda5 1140 4069 41606 4300 149 32 1448 18890 0 4680 23190 8 6 4707013 sda6 960 2263 25778 8050 876 125 8008 16600 0 8060 24650 8 7 530113 sda7 2 0 16 20 0 0 0 0 0 20 20 8 16 17783239 sdb 14 62 176 20 1 0 8 0 0 20 20 8 17 17775891 sdb1 13 62 174 10 1 0 8 0 0 10 10 8 32 17783239 sdc 14 62 176 10 1 0 8 0 0 10 10 8 33 17775891 sdc1 13 62 174 0 1 0 8 0 0 0 0 8 48 35566479 sdd 15 62 184 10 1 0 8 0 0 10 10 8 49 35559846 sdd1 14 62 182 10 1 0 8 0 0 10 10 ------------------------------------------------------ # fdisk -l /dev/sdd kernel version 132096 Disk /dev/sdd: 255 heads, 63 sectors, 4427 cylinders Units = cylinders of 16065 * 512 bytes Device Boot Start End Blocks Id System /dev/sdd1 * 1 4427 35559846 83 Linux
About 5% of the space on any normal filesystem is reserved for root, and is not shown in the 'available' display.