{"id":3778,"date":"2021-03-22T12:00:48","date_gmt":"2021-03-22T19:00:48","guid":{"rendered":"https:\/\/phisonblog.com\/?p=3778"},"modified":"2022-06-14T08:11:08","modified_gmt":"2022-06-14T15:11:08","slug":"sd-7-0-express-making-sd-bigger-and-faster-2","status":"publish","type":"post","link":"https:\/\/phisonblog.com\/zh-tw\/sd-7-0-express-making-sd-bigger-and-faster-2\/","title":{"rendered":"SD 7.0 \u5feb\u6377\u7248"},"content":{"rendered":"

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SD Express 7.0 cards can transfer data faster than their predecessors, thanks to a new interface. Here\u2019s what you need to know about what changed and how that affects performance.<\/p>\n

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Terminology<\/h3>\n

SD Express 7.0 covers two different but connected concepts, so to avoid confusion, let\u2019s clarify how they fit together:<\/p>\n

SD 7.0 is a specification for Secure Digital cards<\/a> introduced in 2018. It updated the existing specifications and added two main elements.<\/p>\n

The first element, SD Express, is a new interface that allows for faster data transfers to and from SD cards.<\/p>\n

The second element, SDUC, is a new class of cards that allows for greater capacity.<\/p>\n

While \u201cSD Express 7.0\u201d isn\u2019t necessarily an official term, it is a useful one. It refers to a card or device that uses the Express interface but is made for the SD 7.0 specification instead of later specifications such as 8.0, introduced in 2020.<\/p>\n

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\"\"<\/a>
Read: Securing SSDs with Code Signing and Digital Signatures<\/div><\/div><\/div><\/div><\/div>\n

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Key specifications and historical context<\/h3>\n

SD 7.0 Express allows for a maximum transfer rate of 985 MB\/s<\/a>. That compares with 624 MB\/s in the previous fastest SD format.<\/p>\n

(The \u201cExpress\u201d term intentionally indicates a new generation of transfer speeds following on from the \u201cUltra High Speed\u201d generation, which brought UHS-I, UHS-II, and UHS-III.)<\/p>\n

SDUC cards can have a maximum capacity of 128 TB<\/a>. That\u2019s a dramatic increase from the 2TB maximum in previous cards.<\/p>\n

\u201cUC\u201d stands for Ultra Capacity and follows on from the original\/basic SD, HC (High Capacity), and XC (eXtended Capacity.)<\/p>\n

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Background and rationale<\/h3>\n

As with previous SD standards, SD 7.0 was introduced by the SD Association, a non-profit industry group that works to make sure SD equipment is compatible across devices and manufacturers. When developing both SD Express and SDUC as part of the new specification, the SD Association was motivated by the increasing availability of consumer video equipment with:<\/p>\n