hi everybody,

In the MDB structure for a HFS volume has a member.

drxtTClpSiz, this member stores the clump size for the

extents overflow file.

In the linux code it is calculated as follows

vol.mdb.drXTClpSiz = vol.mdb.drNmAlBlks / 128 * vol.mdb.drAlBlkSiz;

where

vol.mdb.drXTClpSiz = Stores the Clump size for the extents overflow file.

vol.mdb.drNmAlBlks = Stores the number of Allocation blocks for the HFS volume

vol.mdb.drAlBlkSiz = Stores the number of bytes per Allocation Block.

My doubt is why this formula is used to calculate the Extent file's clump size.

Can i make it equal to just clump size calculated for the Volume??

/*Info*/

1. A allocation block is integral times of a Logical Block , which for HFS is 512 bytes.

2. Clump size is integral times of Allocation Block size and it is the amount of space allocated when a file is created to store the file contents.

Waiting for your explanations!

Bye

Biswaroop