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Seagate hey. Does that mean that we only get 19.5Gb because of the way seagate work it out?
That has nothing to do with Seagate or any brand for that matter. When a HD actually gives you so much data when the box says another amount it's because of the way a Gigabyte is technically counted. Me and you think a Gigabyte is actually 1000MB's but in reality it's not. So added that a couple of hundred times when you're dealing with 200 Gigabytes or whatnot and you get a big decrease in space. My Western Digital was like this and so was my Samsung.
And BTW it's useless trying to figure out what HD is the best. Go to www.newegg.com and you'll see that a million people have a million different opinions about different brands of HD. Seagate for all the people who are talking smack are found in MANY computers as OEM equipment because they're reliable.