sounds like its an aladdin.
you'll prolly need a new bios to see all 500GB(best to go for a .67 bios too), then use SlaYer 2.7(as its the latest) to setup with F & G partitions and use xbpartitioner to format/resize the partitions. Remember that any single partition bigger than 256GB will corrupt unless setup correctly.
SlaYers site is down so if you need a copy, please pm me as have a few copies floating around.....LOL
Bookmarks