Windows 7 taking more space than Vista?

Windows 7 taking more space than Vista? I've just done an upgrade from Windows Vista Home to Windows 7 Home. I had previously done a backup of all the files i needed to keep ( pics, music, emails,...) on another computer.
Asked by: Guest \| Views: 231

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Guest [Entry]

"The difference will be decimal GB versus binary GB and file system formatting/overhead. HDD manufacturers always quote sizes in decimal units.

1 GB (decimal) = 1,000,000,000

1 GiB (binary) = 1024 * 1024 * 1024 = 1,073,741,824

So, 160,000,000,000 / 1,073,741,824 = 149,011,611,938.

The difference between 136 GiB and 149 GiB is probably the file system overhead plus the installation size for W7 - doesn't seem unreasonable.

Remember too that the size that the files require on disk is greater than their total size in bytes due to disk allocation units; each file is rounded up to the DAU."