Base 15-inch MacBook Air SSD with 256GB NAND chips, resulting in 30-50% faster speeds than models with 512GB SSD and above.
The SSD read speed of the 256GB MacBook Air with M2 is 1446MB/s, while the MacBook Air with M1 has the same read speed of 2900MB/s.
This is because the 256GB MacBook Air used to have two NAND chips of 128GB each, resulting in an SSD that was twice as fast.
With the release of the MacBook Air 13 with M2, the company began consuming a single 256GB NAND chip. The MacBook Air 15 uses a similar design. The 512GB models use two NAND chips, resulting in SSD speeds that are more than twice as fast as the base configuration.
The low speed of the SSD is not very noticeable in everyday gathering. It manifests itself under load and when copying large files.
Source: Iphones RU
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