oi, using:
http://www.siemenscatalist.com/Files...ar_apr.pdf(w/o the spaces)as a reference, it ought to support any s-ata 5400rpm internal hard drive.the largest you'll be likely to find is 1TB (1,000 GB).if you claim that the 250GB is not recognised, it could be because it was not installed properly, or perhaps it needed a driver to be installed, or that it wasn't activated within the bios, or that it needed to be formatted, et cetera.lemme know if there's anything else you'd like to know.regards, jawala