Re: os.stat access and modify time same on WinXP
From: rbt (rbt_at_athop1.ath.vt.edu)
Date: 03/23/05
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- In reply to: Peter Hansen: "Re: os.stat access and modify time same on WinXP"
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Date: Wed, 23 Mar 2005 14:05:38 -0500
Peter Hansen wrote:
> rbt wrote:
>
>> I'm using the standard NTFS file system. The only time the access time
>> is updated is when the file is modified or saved (with no changes).
>> What's up with that? Shouldn't a read/view update the access time?
>
>
> See
> http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us/Default.asp?url=/resources/documentation/Windows/XP/all/reskit/en-us/prkc_fil_punq.asp
>
>
> Quoting:
> '''
> The Last Access Time on disk is not always current because NTFS looks
> for a one-hour interval before forcing the Last Access Time updates to
> disk. NTFS also delays writing the Last Access Time to disk when users
> or programs perform read-only operations on a file or folder, such as
> listing the folder's contents or reading (but not changing) a file in
> the folder. If the Last Access Time is kept current on disk for read
> operations, all read operations become write operations, which impacts
> NTFS performance.
>
> Note
>
> * File-based queries of Last Access Time are accurate even if all
> on-disk values are not current. NTFS returns the correct value on
> queries because the accurate value is stored in memory.
> '''
>
> Does that help?
>
> (Just went through this myself the other day.)
> -Peter
Yes, it does. Thank you.
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