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Author Topic: SD geometry  (Read 1435 times)

Offline andyj

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SD geometry
« on: May 17, 2015, 10:10:42 AM »
I've noticed that the Sandisk 8 GB micro SD cards I'm using have a factory C/H/S geometry of 2029/178/43 with a file system formatted with ID "b" (W95 FAT32). piCore-6.1beta1_v7-X reports itself as 242656/4/16 but the same card in my Slackware box says it's 1022/245/62. I've tried fdisk on both the PI and Slackware to set it to the factory geometry but it always winds up with the 1022/245/62 geometry. I know that technically there aren't any cylinders or heads, but I wonder if the factory geometry is somehow selected to work with the wear leveling algorithm in the card. Or with LBA would any of this matter? Has anyone noticed any variations in performance due to geometry?