In an NTFS file-system, is the size of $BITMAP rounded up? I have seen
one report (from a copy of the Linux NTFS project) that it is rounded up
to be a multiple of 8 bytes, and I have certainly seen this, but only
rarely. It seems that DISKPART and FORMAT don’t normally lay out a
filesystem which needs this rounding.
By the way, this isn’t simply an ‘academic’ question: it is to do with
some integrity checking being performed on an NTFS volume.
Thanks for any confirmation, insights, etc!
There is nothing like bitmap file size rounded up.but after analyzing it seems that NTFS
Is rounding up to 8 bytes 
Strange.
Since the size of $Bitmap is no minimum or maximum.
When extending or shrinking a bitmap, NTFS rounds the size of the bitmap to an 8 byte boundary. One reason is probably performance, so you don’t have to extend it one byte at a time.
Can you explain the integrity checking issue you are experiencing? Are you talking about Windows chkdsk running on a Windows NTFS file system, or some other combination?
Craig
-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of John Leonard
Sent: Thursday, July 24, 2014 1:07 AM
To: Windows File Systems Devs Interest List
Subject: [ntfsd] NTFS $Bitmap file size
In an NTFS file-system, is the size of $BITMAP rounded up? I have seen one report (from a copy of the Linux NTFS project) that it is rounded up to be a multiple of 8 bytes, and I have certainly seen this, but only rarely. It seems that DISKPART and FORMAT don’t normally lay out a filesystem which needs this rounding.
By the way, this isn’t simply an ‘academic’ question: it is to do with some integrity checking being performed on an NTFS volume.
Thanks for any confirmation, insights, etc!
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