It helps to point out, that legitimate copies of Windows 7 DVDs were
offered by digitalriver. And URLs for Windows 7 downloads have been
floating around for some time. When digitalriver and associates
stop selling Windows 7 and move on to Windows 8, then you're not likely
to have access to those files.
That's how I got copies of Windows 7 SP1 DVDs, for repairing my laptop.
By downloading them from digitalriver.
If you find such a download link, and think it's dodgy, run md5sum
and sha1sum, pop the checksums into Google, and see if you can find
any articles confirming they're the correct checksums. So if you
have to do this operation five years from now (when all so-called
legit sources are shut down), that would be a potential method for
determining whether the download was adulterated.
As a kickoff point, the file names on my downloads were
X17-24208.iso 32-bit Windows 7 Home Premium x86 SP1 (bootable)
X17-24209.iso 64-bit Windows 7 Home Premium x64 SP1 (bootable)
A search on those file names, should dig up web pages of
similarly named ISOs. ISOs are available for a limited number
of other countries and languages. Certain countries, the
images should be unavailable (as digitalriver or other sellers,
may be banned from selling there). Availability of an ISO
in your own language, is by no means assured. It's accidental
rather than planned and advertised.
*******
The situation is a bit different on Windows 8. And not in
a good way. (I don't have all the files to verify this for
myself, so treat this as a research topic...)
On Windows 7, whether you had boxed DVDs or you downloaded the
digitalriver version, the DVD would have an install.wim file.
That was the file with the install files in it (could be around
2GB in size, and is a file on the ISO9660).
On Windows 8, a boxed DVD would use an install.wim.
The Windows 8 $39.95 electronic download version, the main file
is install.esd. The install.esd is the encrypted version of install.wim.
Each electronic download, with an install.esd in it, the install.esd
is different for each download operation.
Now, say I give my DVD to a friend. The install.esd potentially carries
some information with it, as to where it was initially downloaded.
There is a ridiculously complicated means to convert from install.esd
to install.wim here.
http://win7vista.com/index.php?topic=32733.0
"it's relatively easy. Install Win8 in vbox (vhd). sysprep win8.
mount vhd in windows and capture installation with imagex to
install.wim. replace install.esd with install.wim and
you are done - the encryption is gone"
And the "not in a good way" part of this ? You cannot checksum
an electronically downloaded DVD and verify it is authentic.
Whereas, with the Windows 7 ones, everything floating around
(boxed or electronic, with the same SKU) would be the same.
And simpler checks, would verify you had the real McCoy.
I think, when I used the same order number, and downloaded
the electronic version a second time (thinking the first download
was corrupted), even the install.esd on that was different.
So each download operation, for some reason, is uniquely tagged.
Why that has value, is unclear to me, as it's the license key
that matters, not the DVD itself. The DVD is immaterial. And
how it got to my desk, is also immaterial. I don't get, why that
file is encrypted. If that's what it is.
On Windows 7, this would be one less thing to worry about.
No issue there.
Paul