Back in 2011, Apple paid $500 million for Anobit, a company producing enterprise grade SSD controllers. Since Apple was already integrating custom SSD controll

Back in 2011, Apple paid $500 million for Anobit, a company producing enterprise grade SSD controllers. Since Apple was already integrating custom SSD controllers onto their A series SOCs, presumably the purchase was about Anobit patents. > Anobit appears to be applying a lot of signal processing techniques in addition to ECC to address the issue of NAND reliability and data retention... promising significant improvements in NAND longevity and reliability. At the high end Anobit promises 50,000 p/e cycles out of consumer grade MLC NAND https://www.anandtech.com/show/5258/apple-acquires-anobit-bringing-nand-endurance-technology-inhouse https://www.anandtech.com/show/5258/apple-acquires-anobit-br... Apple has said in the past that they are addressing improved data stability at the hardware level, presumably using those acquired patents. > Explicitly not checksumming user data is a little more interesting. The APFS engineers I talked to cited strong ECC protection within Apple storage devices... The devices have a bit error rate that's low enough to expect no errors over the device's lifetime. https://arstechnica.com/gadgets/2016/06/a-zfs-developers-analysis-of-the-good-and-bad-in-apples-new-apfs-file-system/ https://arstechnica.com/gadgets/2016/06/a-zfs-developers-ana...