Hi all, I'm relatively new to Mac OSX (I love it) -- coming from Win98. (I've never worked on a version higher than Win98; so, what I'm telling now may refer to Win XP as well). As far as I can see, the 64-bit file system in Mac OSX splits files in 8 kB harddisk sectors (while Windows 32-bit, for example, uses 1 kB sectors for that matter). Am I right? I'm doing web design in Photoshop CS (and ImageReady CS). Obviously, small JPG and GIF file sizes are essential for me. On Mac OSX and Photoshop I seem to be unable to save JPGs and GIFs at the file size Photoshop predicts as shown in its "save as" preview. E.g. a GIF with a solid one colour area is not really as indicated 4 kB in size when stored, but 40 kB! The same happens to JPGs. The "save as" preview says 10 kB, whereas Finder says, when stored, 100 kB! This is unacceptable for web design. Well, as I said, I've noticed that file sizes are rounded up to the next 8 kB sector. But I don't understand why this should make the file size approx. 10 times bigger. And why can Mac OSX -- vice versa -- read the file sizes of Win98 generated GIFs and JPGs correctly? For a GIF 4 kB in size Finder and Photoshop correctly indicates 4 kB. But loading and saving this file turns it into an (approx.) 40 kB file. Why? I don't store colour profiles, colour proofs, layers or any other additional data in the files. They are as raw as they get. GraphicConverter (included in Mac OSX) can't make them smaller either. Photoshop has (with the integrated ImageReady software) a wonderful professional tool for web designers. But for generating the final file sizes I have to go back to Win98 (horror), then return to the Mac for the upload. This is ridiculous. I hope I'm doing something wrong. What's the trick? I have checked all Mac OSX and Photoshop documents, manuals, help archives. No info found on this topic. Any help is greatly appreciated. Thank you! Cheers.