It’s amazing when a skilled hacker reverse-engineers a proprietary format and shares the nitty-gritty with everyone. Today is a day when we get one such write-up – about MemoryStick. It is one of those proprietary formats, a staple of Sony equipment, these SD-card-like storage devices were evidently designed to help pad Sony’s pockets, as we can see from the tight lock-in and inflated prices. As such, this format has always remained unapproachable to hackers. No more – [Dmitry Grinberg] is here with an extensive breakdown of MemoryStick protocol and internals.
If you ever want to read about a protocol that is not exactly sanely designed, from physical layer quirks to things like inexplicable large differences between MemoryStick and MemoryStick Pro, this will be an entertaining read for hackers of all calibers. Dmitry doesn’t just describe the bad parts of the design, however, as much as that rant is entertaining to read – most of the page is taken by register summaries, struct descriptions and insights, the substance about MemoryStick that we never got.
One sentence is taken to link to a related side project of [Dmitry] that’s a rabbithole on its own – he has binary patched MemoryStick drivers for PalmOS to add MemoryStick Pro support to some of the Sony Clie handhelds. Given the aforementioned differences between non-Pro and Pro standards, it’s a monumental undertaking for a device older than some of this site’s readers, and we can’t help but be impressed.
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