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#1
August 14th 10, 04:43 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek 
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#2
August 14th 10, 11:19 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On Aug 14, 4:43*am, sobriquet wrote:
Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C:http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Do you have NTFS compression enabled forall or some of the files? Michael www.cnwrecovery.com
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#3
August 14th 10, 11:23 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On 14 aug, 12:19, " wrote:
On Aug 14, 4:43*am, sobriquet wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C:http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Do you have NTFS compression enabled forall or some of the files? Michaelwww.cnwrecovery.com Not that I know of. In the main properties for the drive, I don't have the box checked for compressing files on that volume to save space.
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#4
August 14th 10, 03:14 PM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On Aug 14, 11:23*am, sobriquet wrote:
On 14 aug, 12:19, " wrote: On Aug 14, 4:43*am, sobriquet wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C:http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Do you have NTFS compression enabled forall or some of the files? Michaelwww.cnwrecovery.com Not that I know of. In the main properties for the drive, I don't have the box checked for compressing files on that volume to save space.- Hide quoted text - - Show quoted text - Try a chkdsk and see if the results stay the same. Michael
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#5
August 15th 10, 04:33 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
sobriquet wrote:
Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Probaly sparse files. NTFS does now write blocks that are filled with zeros. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
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#6
August 16th 10, 12:34 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On 15 aug, 05:33, Arno wrote:
sobriquet wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Probaly sparse files. NTFS does now write blocks that are filled with zeros. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: *ID: 1E25338F *FP: 0C30 5782 9D93 F785 E79C *0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans But surely, if there had been previous data on disk that has been deleted, it would have to write blocks of zeros if a file contains nothing but zeros, otherwise the file would contain data from files that had been stored on that block previously?
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#7
August 16th 10, 04:43 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
sobriquet wrote:
On 15 aug, 05:33, Arno wrote: sobriquet wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Probaly sparse files. NTFS does now write blocks that are filled with zeros. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ?ID: 1E25338F ?FP: 0C30 5782 9D93 F785 E79C ?0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans But surely, if there had been previous data on disk that has been deleted, it would have to write blocks of zeros if a file contains nothing but zeros, otherwise the file would contain data from files that had been stored on that block previously? No. It does not even allocated blocks that would contain all zeros. This is done by the block-to-file mapping mechansism. A sparse file only gets blocks allocated for the parts that contain actual data. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
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#8
August 16th 10, 07:39 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On 16 aug, 05:43, Arno wrote:
sobriquet wrote: On 15 aug, 05:33, Arno wrote: sobriquet wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Probaly sparse files. NTFS does now write blocks that are filled with zeros. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ?ID: 1E25338F ?FP: 0C30 5782 9D93 F785 E79C ?0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans But surely, if there had been previous data on disk that has been deleted, it would have to write blocks of zeros if a file contains nothing but zeros, otherwise the file would contain data from files that had been stored on that block previously? No. It does not even allocated blocks that would contain all zeros. This is done by the block-to-file mapping mechansism. A sparse file only gets blocks allocated for the parts that contain actual data. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: *ID: 1E25338F *FP: 0C30 5782 9D93 F785 E79C *0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans Ah ok.. but only on NTFS, or on FAT16/32 as well?
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#9
August 16th 10, 07:51 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
On 16/08/2010 08:39, sobriquet wrote:
On 16 aug, 05:43, wrote: wrote: On 15 aug, 05:33, wrote: wrote: Hi. Something baffles me. Perhaps someone here can explain it. If I go to the properties of my C drive on my laptop, the size reported is smaller than the total size of the files and folders on drive C: http://img200.imageshack.us/img200/2843/dataa.jpg How can the size of all selected files and folders on the C drive exceed the total capacity of that same C drive? Greetings and thanks in advance for any explanations, Niek Probaly sparse files. NTFS does now write blocks that are filled with zeros. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ?ID: 1E25338F ?FP: 0C30 5782 9D93 F785 E79C ?0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans But surely, if there had been previous data on disk that has been deleted, it would have to write blocks of zeros if a file contains nothing but zeros, otherwise the file would contain data from files that had been stored on that block previously? No. It does not even allocated blocks that would contain all zeros. This is done by the block-to-file mapping mechansism. A sparse file only gets blocks allocated for the parts that contain actual data. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans Ah ok.. but only on NTFS, or on FAT16/32 as well? Only NTFS (on Windows - lots of file systems on *nix support sparse files too).
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#10
August 16th 10, 08:00 AM
posted to comp.sys.ibm.pc.hardware.storage
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puzzled about files on disk
David Brown wrote:
On 16/08/2010 08:39, sobriquet wrote: A sparse file only gets blocks allocated for the parts that contain actual data. Arno Ah ok.. but only on NTFS, or on FAT16/32 as well? Only NTFS (on Windows - lots of file systems on *nix support sparse files too). The mechanism may be a bit different: On *nix, a spares file has blocks unallocated that were not written. These return zeros on reading, but if you write zeros they get allocated. (Found that out the hard way....) If I understand this correctly, NTFS does not allocate blocks if you write all zeros to an aera. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans
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