Turtle Beach X41 Xbox 360 Wireless Gaming Headset $105 at eBay
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Can I buy it for my PS3 80GB?
Yes you can.
Very tempting, but I think I'm going to regret not buying a 500GB if I buy this. Anybody knows if all the 2.5" 500GB are 3 platters?
They're 2 platters if they are 9.5mm high (which is the standard height)-- there's simply no room in that height for a 3rd platter.
Just beware that after PS3 formatted a 500GB HDD, it has much less usage space than formatted on the Windows in NTFS.
500GB bit to byte formatted is about 465GB actual disk capacity. When PS3 formats the HDD, it reserves about 15% which makes it only about 395GB out of 465GB usable free space on the PS3.
This has been true for 40GB, 80GB, 120GB, 160GB and 320GB after formatted on the PS3.
When the HDD is small such as 40GB or 80GB, it's less obvious, but when it's 500GB, loosing 100GB of disk space is a lot.
Actually #4, someone else pointed out a couple of vendors have a 3 x 167GB platter 2.5" in 9.5mm high, while a few others have 12mm high for the same.
And #5, the IEEE standard terminology is 500GB (Giga-byte) = 457GiB (Giga-binary-byte or Gibi-byte), not "bit to byte" formatted. The former (Giga) is 10^9 whereas the latter (Gibi) is 2^30.
As far as "reservation," there are several things at work. Every filesystem has overhead, even FAT-based (FAT, NTFS, etc...), that uses space. Then POSIX inode-based filesystems (UNIX/UNIX-like/Linux systems) often have additional reservation for root-only/system write access -- largely so when the disk fills up, some operations can still occur, although it also combats fragementation (which is rampant when a disk is near full). Additional space may be used for the OS itself as well.