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Finding Block Size

M

MrFace

2[H]4U
Joined
Feb 23, 2003
Messages
2,716
How do I find the the block size of a hard drive once it has been formatted?
 
and rebooting to do a check disk is not an option, these are servers that can not be restarted unless it is for emergencies :D
 
The default is 4KB, that's very likely what these are. You can find the size if you can read the boot sector off the disk; extract byte 0x0B and it's how many sectors per cluster there. Multiply that by 512 bytes and you've got the cluster size. Oh, got it. Create a 1KB file (or find one), hit properties, and see how much "space on disk" it takes up.

Why does it matter?

 
unhappy_mage said:
The default is 4KB, that's very likely what these are. You can find the size if you can read the boot sector off the disk; extract byte 0x0B and it's how many sectors per cluster there. Multiply that by 512 bytes and you've got the cluster size. Oh, got it. Create a 1KB file (or find one), hit properties, and see how much "space on disk" it takes up.

Why does it matter?

Click to expand...


Um, riiiiiight...

I need this information to determine which of our servers will not work with our defragmentation software.
 
Actually thats works perfect for verifying block size on a drive. On my graphics workstation I have the first SCSI RAID volume (C) set to a 4KB default block size as this drive simply contains the OS and apps. The second RAID volume (D) I have set to 64KB as this volume is storage for a massive amount of very large files (typically hundreds of MB each). I created a 1 byte txt file with a single digit in it contents and copied it to both drives. Pull up the properties and viola - your block size is displayed as the file is smaller than the block size it will use exactly one block.

blocktest.jpg
 
MixManSC said:
Actually thats works perfect for verifying block size on a drive. On my graphics workstation I have the first SCSI RAID volume (C) set to a 4KB default block size as this drive simply contains the OS and apps. The second RAID volume (D) I have set to 64KB as this volume is storage for a massive amount of very large files (typically hundreds of MB each). I created a 1 byte txt file with a single digit in it contents and copied it to both drives. Pull up the properties and viola - your block size is displayed as the file is smaller than the block size it will use exactly one block.
Click to expand...

Bah, wish there was an easier way. Having to go through 50 servers will not be fun...thanks!
 
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