Here you GO!
I've made this with microdem SRTM-30 Data
and converted to Geotiff (tif) data type,
i hope you can work with this, the data is detailed so the real map is in a zip file...
I added also a screenshot from gloabl mapper, where you can already see some cities pointed out,
this will givze you already a good idea where the cities are situated and wich part of the map is of your intrest....
ps: I don't see either a problem of your hardrive
ps2: The ocean is in blue, that's a good thing,
what you should do is this:
- change the contrast till the coastline has the minimum value for land instead of sealevel,
- color the ocean in a color beneath sea level...
- i forgot right now the sealevel gray-value, but you could find that in the wiki or a post about that... have a look overthere!!!

****
Here i looked it up
It appears that sea level ends at R:48,G:48,B:48 and land begins at R:49,G:49,B:49.
have a look overhere for more information:
http://www.hookedgamers.com/wiki/Sid_Me ... Height_Map
AND have a look overhere:
http://hookedforums.com/a/viewtopic.php?t=1347