Unfortunately, this creates a problem for Windows XP users. For now, WD isn't claiming that Advanced Format delivers any particular advantage and AF drives aren't carrying much of a premium, if any.Īdvanced Format drives emulate a 512 byte sector size, to keep backwards compatibility intact, by mapping eight logical 512 byte sectors to a single physical sector. This last contains an extra bonus-because read and write speeds are typically reported as an average, knocking off the slowest tracks would make the hard drive look faster in a benchmark without actually changing performance at all. Smaller platters are one option, larger storage capacity is another, and removing the innermost tracks of the platter is a third. Western Digital isn't lying about the efficiency benefits of a 4K sector drive, but the company can use that space in a number of ways. A WD10EARS and a WD10EADS have exactly the same unformatted capacity and Windows reports both drives offer 931GB of storage space.
This has been misinterpreted in a number of circles as meaning that an Advanced Format HDD offers more storage capacity than a normal one.
ECC accounts for 5.5 percent of this the rest is presumably a mix of efficiency gains in other areas. In Western Digital's whitepaper on the subject (PDF), the company states that it can "gain approximately 7-11% in disk space" by using Advanced Format. We want to clear up some confusion regarding the near-term benefits of Advanced Format. Debunking the Myth of Additional Drive Space
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