The Intel® SSD 530 Series have 512 Bytes per sector.
This information can be calculated based on the values from the Intel® SSD 530 Series (2.5 inch) Product Specification.
In page 8, it has the Unformatted Capacity expressed in "Total User Addressable Sectors in LBA mode".
For the 80 GB drive, the amount of Total User Addressable Sectors is: 156,301,488
Since each sector = 512 Bytes.
156,301,488 (sectors) x 512 (bytes per sector) = 80026361856 bytes, which is equivalent to 80 GB
I hope this information helps you.