![]() Sync section: The sync mark indicates the beginning of the sector and provides timing alignment.Gap section: The gap separates sectors.The structure of this sector layout was designed as follows: The legacy sector format contains a Gap section, a Sync section, an Address Mark section, a Data section, and Error Correction Code (ECC) section (Figure 1).įigure 1. ![]() Many aspects of modern computer systems still have design assumptions based on this format standard. Backgroundįor over 30 years, data stored on hard drives has been formatted into small logical blocks called sectors, with a legacy sector size of 512 bytes. This paper provides the context for this migration, as well as pointing out the long-term benefits to customers and potential pitfalls to be avoided in the move from 512 bytes to 4K sectors. As storage densities increased dramatically over the years, one of the most elemental aspects of hard drive design, the logical block format size known as a sector, had remained constant.Īround 2010, hard drive companies began migrating away from the legacy sector size of 512 bytes to a larger, more efficient sector size of 4,096 bytes, generally referred to as 4K sectors and now referred to as the Advanced Format by IDEMA (The International Disk Drive Equipment and Materials Association). A change has come in the hard drive industry.
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