how to change OS block size in WIndows

March 10, 2011 at 19:35:20
Specs: windows 2003
I understood windows uses 512bytes as block size. Any way how do i change that ? I'm using windows2003.


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March 10, 2011 at 19:40:58
If you mean the hard disk sector size the answer is no.
This is a fixed characteristic of the disk drive and cannot be changed.
If you mean something else you will need to explain.

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March 10, 2011 at 20:12:48
I'm not good in windows.
Could you please explain what this Bytes per Sector is ?
Basically for one testing, i need my IO's to happen more than 512bytes, ie., it need to send IO size upto 8192Kbytes from my Windows OS --> Emulex HBA --> --> SAN disks instead of it default settings in windows. Is there any registry to change this in windows OS side to increase this parameter ? How do I achieve this? I think my question makes sense.

C:\fsutil fsinfo ntfsinfo d:
NTFS Volume Serial Number : 0x32283c08283bca1d
Version : 3.1
Number Sectors : 0x00000000084147ff
Total Clusters : 0x00000000010828ff
Free Clusters : 0x00000000007c723f
Total Reserved : 0x0000000000000000
Bytes Per Sector : 512
Bytes Per Cluster : 4096
Bytes Per FileRecord Segment : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length : 0x00000000009f0000
Mft Start Lcn : 0x00000000000c0000
Mft2 Start Lcn : 0x000000000084147f
Mft Zone Start : 0x00000000000c09e0
Mft Zone End : 0x00000000000cd200


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March 10, 2011 at 21:00:16
Bytes per sector is simply the number of bytes in a sector.
Sorry, but your question makes very little sense. Applications do not write directly to disk sectors but to files. Sector size is irrelevant.

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March 11, 2011 at 07:03:26
Nothing writes to sectors. Everything writes to clusters which are a collection of sectors with the norm being 4kb clusters.

Karthik73500 I think you are confusing I/O size with cluster size. I/O is the transport size. Cluster size is the distination.

You can change the cluster size on the Nonsytem/boot disk by formatting. This is not something you can change in the registry.

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