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From: Andrew C. <cl...@gn...> - 2002-11-23 21:04:55
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On Sat, Nov 23, 2002 at 10:08:14AM +0100, Szakacsits Szabolcs wrote: > > Hi Andries, > > Thanks for your quick answer. I CC: my reply to some potentially > interested parties. > > On Fri, 22 Nov 2002 And...@cw... wrote: > > > > Unfortunately the issue doesn't look very good :( > > The truth is k=10^3, M=10^6, G=10^9. > > Yes, as I pointed out on http://physics.nist.gov/cuu/Units/binary.html > > > Slowly, old programs that use binary units are converted > > to decimal ones. But there may be backwards compatibility > > reasons to leave things. > > Here is a summary how different tools uses, k, M, G prefixes > (please correct me if some entry is wrong, I made the list very > quickly, some by just remembering). > > k M G > fdisk 2^10 2^20 10^3*2^20 > cfdisk 10^3 10^6 10^9 > sfdisk 2^10 2^20 > parted 2^10 2^20 > resize_reiserfs 2^10 2^20 2^30 > ntfsresize 2^10 2^20 2^30 > fdisk (Windows) 2^10 2^20 > > resize_reiserfs seems especially unlucky since it uses binary units > but recommends cfdisk that uses decimal one. If one shrinks a reiserfs > and gives the same or even a bit bigger units for resizing the given > partition then he has a great chance the partition table, filesystem > and/or his data will be destroyed sooner or later (a new partition can > start in the middle of the resized filesystem). Just thought I'd comment on the situation with Parted. If you resize a file system that Parted supports directly, then obviously the constraint solver will make sure everything fits :) (It's one of the arguments in favour of coupling a fs interface with a partition one) If you resize a file system externally, then you have two options for changing the partition table: (1) rm and mkpart. If you get the numbers wrong, you're screwed. (2) rm and rescue. Rescue works like gpart. (Looks at signatures/superblocks, and figures out where everything should be) In Parted, I plan to change the interface to allow arbitary units to be expressed. I plan to change the default unit at the same time... I'd rather not confuse users in the mean time. Do you think I should? (Maybe I should just hurry up and do units... it's not hard!) Cheers, Andrew |
