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Updated FAT overhead notes

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Jeff Parsons 2017-06-01 21:43:59 -07:00 • committed by Jeff Parsons
commit 6b35166b1f
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modules/diskdump/lib/diskdump.js
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@ -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