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People keep forgetting that this FS was designed by Apple for use in their appliances. Apple devices, save for their least sold model (MacPro), in their least

People keep forgetting that this FS was designed by Apple for use in their appliances. Apple devices, save for their least sold model (MacPro), in their least sold product line (Mac) are consumer devices with no ECC RAM. Most people don't know what ECC RAM is, most don't care, and won't pay more for it. For Apple, it doesn't make sense to switch to ECC for system memory, however, if they implement storage ECC at block level in their SSD controller (Apple designes their own SSD controllers), they can obtain the same functionality at much lower cost (only flash controller RAM needs to be ECC).

scott_karana 9y ago
> Apple designes their own SSD controllers Huh! I assumed they used off the shelf stuff. Do you have any articles about this? :)
- mikhailt 9y ago
  The first time I've heard of this was when Anandtech did their review of iPhone 7 and it has the Apple's custom SSD controller: http://www.anandtech.com/show/10685/the-iphone-7-and-iphone-7-plus-review/4 http://www.anandtech.com/show/10685/the-iphone-7-and-iphone-... They mentioned the '15 MacBook was the first to use Apple's custom SSD controller, which iFixit took a picture of here: https://www.ifixit.com/Teardown/Retina+Macbook+2015+Teardown/39841#s90315 https://www.ifixit.com/Teardown/Retina+Macbook+2015+Teardown... They most likely started off from Apple's purchase of Anobit, the custom flash controller designer, back in 2011: https://en.wikipedia.org/wiki/Anobit https://en.wikipedia.org/wiki/Anobit
comex 9y ago
Except that not all storage devices APFS will be used with have those SSD controllers. If nothing else, Apple still sells Macs with hard drives (not sure if all the SSDs they sell have their controllers). There's also external disks, which Apple will presumably support formatting as APFS.
- Tanegashima 9y ago
  Since when Apple is a server company? All their SSD's use their controllers. As for external disks, Apple couldn't care less, for them, the future is cloud storage.
yuhong 9y ago
The fun thing is that Apple never used "parity" much even back when it was common in PCs
- Tanegashima 9y ago
  Parity was never was common in PCs.

scott_karana 9y ago

> Apple designes their own SSD controllers Huh! I assumed they used off the shelf stuff. Do you have any articles about this? :)

mikhailt 9y ago
The first time I've heard of this was when Anandtech did their review of iPhone 7 and it has the Apple's custom SSD controller: http://www.anandtech.com/show/10685/the-iphone-7-and-iphone-7-plus-review/4 http://www.anandtech.com/show/10685/the-iphone-7-and-iphone-... They mentioned the '15 MacBook was the first to use Apple's custom SSD controller, which iFixit took a picture of here: https://www.ifixit.com/Teardown/Retina+Macbook+2015+Teardown/39841#s90315 https://www.ifixit.com/Teardown/Retina+Macbook+2015+Teardown... They most likely started off from Apple's purchase of Anobit, the custom flash controller designer, back in 2011: https://en.wikipedia.org/wiki/Anobit https://en.wikipedia.org/wiki/Anobit

comex 9y ago

Except that not all storage devices APFS will be used with have those SSD controllers. If nothing else, Apple still sells Macs with hard drives (not sure if all the SSDs they sell have their controllers). There's also external disks, which Apple will presumably support formatting as APFS.

Tanegashima 9y ago
Since when Apple is a server company? All their SSD's use their controllers. As for external disks, Apple couldn't care less, for them, the future is cloud storage.

yuhong 9y ago

The fun thing is that Apple never used "parity" much even back when it was common in PCs

Tanegashima 9y ago
Parity was never was common in PCs.