36.4pseudomarketblahgigabytes=36400000000 bytes

1 real gigabyte is 2^30=1073741824 bytes and that's means your disk has 33.9 real Gigabytes.

rest are what's used up by inodes and bitmaps.


Thank you Wojciech - this is clear for me now.

please show the output of

  grep sectors /var/run/dmesg.boot

da2: 34715MB (71096320 512 byte sectors: 255H 63S/T 4425C)
da0: 17357MB (35548320 512 byte sectors: 255H 63S/T 2212C)
da1: 34715MB (71096640 512 byte sectors: 255H 63S/T 4425C)

The IBM drives I'm playing with are da1 and da2. Soon they will be part of a RAID-5 array with four of these. da0 will go away as it's U160/7200RPM and newer driver on bus are U320/15kRPM.

In addition to that filesystem building, manufacturer's "formatted" capacity
is given in decimal so a Gigabyte...
Then the system, by default reserves 8% of the filesystem for system overfill.

Thanks Jerry also for the explanation.

d.
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