From 6b35166b1f1dc83848e3dfc755aca205b58e69e1 Mon Sep 17 00:00:00 2001 From: Jeff Parsons Date: Thu, 1 Jun 2017 21:43:59 -0700 Subject: [PATCH] Updated FAT overhead notes --- modules/diskdump/lib/diskdump.js | 3 +++ 1 file changed, 3 insertions(+) diff --git a/modules/diskdump/lib/diskdump.js b/modules/diskdump/lib/diskdump.js index a40a3bd57..a640a8749 100644 --- a/modules/diskdump/lib/diskdump.js +++ b/modules/diskdump/lib/diskdump.js @@ -560,6 +560,9 @@ DiskDump.aDefaultBPBs = [ * the overhead OUTSIDE the partition (69 sectors) and the overhead INSIDE the partition (51 sectors). They failed * to account for the reserved cylinder in the first calculation and the fractional cluster in the second calculation, * and then they conflated the two values to produce a single (incorrect) result. + * + * Even if one were to assume that the disk had only 305 cylinders, that would only change the partitioning overhead + * to 1 sector; the file system overhead would still be 51 sectors. */ [ // define BPB for 10Mb hard drive 0xEB, 0xFE, 0x90, // 0x00: JMP instruction, following by 8-byte OEM signature