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Updating time capsule firmware

A NAND-flash page can be written to only if it is in the “free” state.

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One can of course only request just one byte from the operating system, but a full page will be retrieved in the SSD, forcing a lot more data to be read than necessary.To receive a notification email every time a new article is posted on Code Capsule, you can subscribe to the newsletter by filling up the form at the top right corner of the blog.As usual, comments are open at the bottom of this post, and I am always happy to welcome questions, corrections and contributions!Pages cannot be overwritten, and once they become stale, the only way to make them free again is to erase them.However, it is not possible to erase individual pages, and it is only possible to erase whole blocks at once.When writing to an SSD, writes happen by increments of the page size.So even if a write operation affects only one byte, a whole page will be written anyway.In this part, I am explaining how writes are handled at the page and block level, and I talk about the fundamental concepts of write amplification and wear leveling.Moreover, I describe what is a Flash Translation Layer (FTL), and I cover its two main purposes, logical block mapping and garbage collection.Due to the organization of NAND-flash cells, it is not possible to read or write single cells individually.Memory is grouped and is accessed with very specific properties.


  1. Thirty years is a long time. The Macintosh computer debuted more than three decades ago, and I've been involved with this revolutionary system and the community around it since 1984.

  2. This is Part 3 over 6 of "Coding for SSDs", covering Sections 3 and 4. For other parts and sections, you can refer to the Table to Contents. This is a

  3. Mac Mini owner reports/guides on Core 2 Duo CPU Upgrade chip swaps for 2006 to 2008 Mac Minis. Includes notes/tips on running OS X 10.7/Lion on a Core2Duo CPU upgraded Core Duo Mini and info on updating firmware from Mini 1,1 to Mini 2,1 for increasing ram support to 3GB.

  4. This section describes how to implement a basic user experience during UEFI firmware updates. During the process of updating firmware, it is important to provide a visual notice to the end user that an update is being processed. Over time users become accustomed to the typical time it takes for.

  5. More ways to shop Visit an Apple Store, call 1-800-MY-APPLE, or find a reseller.

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