I have found a bug in hdparm v9.43 with the --fibmap option. For certain filesystems it returns incorrect values when compared with filefrag, example below for vfat. Notice the factor of 8 difference between number of extent sectors: 125092 vs 1000736. I have reported this to Mark Lord (author) and am awaiting feedback whether this has been fixed in a later version.
hdparm --fibmap ./edisk5/mnt.erox9t4T/emptyspace.zeros, out=./edisk5/mnt.erox9t4T/emptyspace.zeros: filesystem blocksize 512, begins at LBA 4102144; assuming 512 byte sectors. byte_offset begin_LBA end_LBA sectors 0 4125406 4250497 125092, err=, ret=0 filefrag -b512 -e ./edisk5/mnt.erox9t4T/emptyspace.zeros, out=Filesystem type is: 4d44 File size of ./edisk5/mnt.erox9t4T/emptyspace.zeros is 512376832 (1000736 blocks of 512 bytes) ext: logical_offset: physical_offset: length: expected: flags: 0: 0.. 1000735: 186096.. 1186831: 1000736: 1186824: merged,eof ./edisk5/mnt.erox9t4T/emptyspace.zeros: 1 extent found, err=, ret=0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1484289 Title: hdparm 9.43 -> 9.45+ update request To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/hdparm/+bug/1484289/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
