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Compression algorithms needs to store extra information about how the file was compressed so it can be decompressed later on. If this extra information ends up taking more storage space than is saved by compression, the "compressed" file will take up more space than the initial file.

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Q: Why is a file size larger on a disk than its original size?
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Why size on disk is smaller than Size?

The size is exactly what it sounds like - the size of the file. The size on disk however is not quite as simple. Before I can answer that, we need to review some file system terminology. I'll be using the NTFS file system in these examples, but the same principles apply for most (if not all) other file systems. A cluster is the smallest amount of space that can be allocated on the file system. Cluster size indicates how large the cluster is. The default cluster size for an NTFS volume for a majority of drives around today is 4KB. The size of the volume does change the default cluster size, but for now, we'll assume 4KB. Let's say you have a file that is 1MB. Now, 1MB = 1024KB. So if we divide 1024 by 4 we will get the total number of clusters this file will occupy on the hard drive. In this case, that number is 256. Since these figures divide evenly with no remainder, the size on disk for this file is also going to be 1MB. Now let's use 1.2MB as our example file size. 1.2MB = 1228.8KB. Again, we'll divide 1228.8 by 4 to come up with 307.2. This means that the file will take up 307 whole clusters, and 20% of the last cluster. Since you can not allocate space smaller than a cluster, the entire cluster is considered to be in use. This is where the size on disk value is important. To calculate the size on disk, we have to round the number of clusters up, and then multiply by the cluster size. We'll take 308 * 4 to get 1232KB. In this case, the size will be 1228.8KB, but the size on disk will be 1232KB. So to summarize, the size value is the actual size, but the size on disk measures the amount of space each cluster of the file is going to occupy.


How does Image resolution affect image file size?

The larger the resolution, the larger the file size. When you compress a photo, chances are you are going to lose a lot of information from the photo that degrades picture quality.


How fast do hard disks store?

depends on the hard disk and the size of the file--if your looking for a new hard disk, check what the rpm's are the more rpm's the faster your hard disk is


What does file compression mean?

The logical size of a file is reduced to save disk space for easier and faster transmission over a network or the internet


Is virtual memory another name for hard drive storage?

The size the virtual memory is determined by the size of the page file which saved in your hard disk. Virtual memory only uses the hard disk.