New 14 inch M1 MBP supposed to have 512GB storage, only has 494GB. Is this normal?

New 14 inch M1 MBP is supposed to have 512GB storage, only has 494GB full capacity. Is this normal or did I get short changed? What does yours have?

MacBook Pro Apple Silicon

Posted on Jan 14, 2023 1:37 AM

Reply
Question marked as Top-ranking reply

Posted on Jan 14, 2023 10:42 AM

Total capacity of Rotating Magnetic drives used to be as stated. In addition to all the numbered blocks into which you could actually write data, there were quite a few 'spare' blocks, that the drive controller kept in reserve to substitute for any blocks that were found to be bad, a few at the factory, and many more in the field.


With SSD drives, in some cases the TOTAL capacity is stated, and because blocks are dynamically re-numbered, a small amount, typically 5 to ten percent, are held in reserve as spares. These are not directly available for holding data.


Marketers have taken great liberties with stated drive sizes since there were drives. The classical disclaimer used to be "formatted size will be smaller".


I do not think there is anything wrong with your Mac.

6 replies
Question marked as Top-ranking reply

Jan 14, 2023 10:42 AM in response to tjk

Total capacity of Rotating Magnetic drives used to be as stated. In addition to all the numbered blocks into which you could actually write data, there were quite a few 'spare' blocks, that the drive controller kept in reserve to substitute for any blocks that were found to be bad, a few at the factory, and many more in the field.


With SSD drives, in some cases the TOTAL capacity is stated, and because blocks are dynamically re-numbered, a small amount, typically 5 to ten percent, are held in reserve as spares. These are not directly available for holding data.


Marketers have taken great liberties with stated drive sizes since there were drives. The classical disclaimer used to be "formatted size will be smaller".


I do not think there is anything wrong with your Mac.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

New 14 inch M1 MBP supposed to have 512GB storage, only has 494GB. Is this normal?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.