Microsoft cites
4 ways that Windows 7 will support solid-state drives better than XP or Vista
does First,
Windows 7 will turn off disk defragmentation when it
detects an SSD instead of a spinning disk drive. Defragging disks speed ups
the reading of data from conventional hard drives by moving similar data
together. But flash-based SSDs are already fast at reading data. Rather, SSDs
are slow at writing data. Moreover, the process of erasing and moving data
requires "flashing" the memory cells with high voltage. That gradually wears out
the SSD. Defragmentation thus shortens an SSD's lifespan without improving
performance, Shu said.
Second, Windows 7's new "trim" feature will improve performance three
ways. It will: Reduce the amount of data to be deleted, which improves the SSD's
lifespan; delete garbage data in advance, which speeds up writing of data; and
maximize the amount of unused data, which helps even out the wear and tear on
the SSD, Shu said.
Third, Windows 7 will partition the SSD more efficiently
to cut down on unnecessary read-write cycles, Shu said. This requires
Windows 7 to be installed fresh and not upgraded from XP, he said, since the
latter OS formats SSDs in an inefficient way.
Finally,
Microsoft plans to create a certification program for SSDs. To
win the software maker's logo of approval, SSDs must identify themselves to
Windows 7 properly, prioritize data reads over slower data writes, comply with
the Serial ATA (SATA) drive interface for faster connections, and more, Shu
said. On the other hand,
Microsoft is not taking more radical steps. For
instance, it's not trying any tricks to decrease the number of times data is
written, such as using RAM to cache data, Shu said.