file and folder size

Hi, I'm working on a new computer Sunrise and execution including obtaining my backups before day of the load on my new computer.  When comparing a few folders on the hard drive of my main computer, last night made backups don't always correspond to the size and number of files, at least in some cases, but not all.

I use XP on the old system and my backup hard drive is a Seagate.  There are plenty of room on my Seagate for even more data.

For example, my main computer indicates a file like: 168 concerts and 47781 files while the backup shows 167 concerts and 45623.  Another folder on my main computer will display: 657 megs and 45 files while the backup shows 647 megs and the same 45 files.

Can you explain this for me and if there is a way to check that all my information is actually saved properly?  Also, would you recommend the reset of my program to select all the files I want to save as a new start and then, by running another backup backup?  Thank you

There may be several things happening here.

First, make sure you that you compare 'size' of the folder on a drive in the folder 'size' on the other disk and not "size of the folder on the drive."

"Size on disk" is very often not the same as the 'size' (it's usually larger).  This is because the files are stored in "clusters" of a fixed number of bytes.  There is only one file per cluster and so there is almost always unused space.  This is called "soft"

Cluster size represents the smallest amount of disk space that can be used to hold a file. When the size of the files does not come out to an even multiple of the cluster size, extra space must be used to hold the file (up to the next multiple of the cluster size). On the typical disk partition, the average amount of space that is lost in this way can be calculated using the equation (cluster size) / 2 * (number of files).

For example, suppose that you have 12 ounces of water and only 10 ounces cups.  You need two cups - 20 ounces of "storage" - to hold all the water, and one of them is essentially empty.  On the other hand, if you had 4 oz. cups, you would need three cups - 12 oz of "storage" - and would have no unused space.

Cluster size differs between the various files used by Windows systems.  Most use facilities XP NTFS file system, which has a cluster size default to 4 096 bytes (4 KB) for partitions up to 16 TB.  The FAT file system on the other hand, uses a clusters of 512 bytes and 1, 2, 4, 8, 16, 32, or 64 KB depending on the size of the partition.

External number of readers is preformatted using the FAT file system.  So if you compare "size on disk" and the internal drive uses NTFS and the backup drive uses FAT, there almost certainly will be a different size "on the disc" between the two.

In your first example (168 GB file), it seems that you can not have guaranteed some hidden or system files.  What software do you use to make the backup?

Most of the good software backup has an option to "check".  Exactly what he is "verified" may be different for different applications, but if it is available in the software you have, you have to use.

Tags: Windows

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