Geometry
Posted: Thu Oct 22, 2015 11:49 pm
Good day.
Today's questions are related to the handling of drive geometry by IFW. I know, nothing uses geometry anymore, but I am still worried about it. PS: Why is BBCode disabled? I had to edit the tables below because [code][/code] doesn't work :-(
First question:
Geometry is set to the standard "too big" value of 1023/254/63 for most of my partitions, which is normal since even maximum C*H*S is below the LBA values for the partitions, so we end-up with the industry standard. However, I have noticed that sometimes IFW will present me with a C value of 1022 instead of 1023. Even PartInfo shows this:
MBR Partition Information (HD0 - 0x1B40FA96)
(CHS: 1022/254/63) (WCHS: 38913/255/63)
+====+====+=============+====+=============+=============+=============+
| 0: | 00 | 0000 032 33 | 27 | 1023 254 63 | 2048 | 33554432 |
| 1: | 80 | 1023 254 63 | 07 | 1023 254 63 | 33556480 | 409600 |
| 2: | 00 | 1023 254 63 | 07 | 1023 254 63 | 33966080 | 127815680 |
| 3: | 00 | 1023 254 63 | 07 | 1023 254 63 | 161781760 | 463357952 |
+====+====+=============+====+=============+=============+=============+
As you can see, most of the "C" values are at maximum 1023, but see above the partition listing, in the header of the table -> (CHS: 1022/254/63). Shouldn't this be 1023/254/63? I see 1022 also in IFW: If I select to make a backup in IFW, and in the partition selection screen I highlight partition 2 and click "Information" button, it shows CHS as 1022/254/63; the same "bug" appears in Geometry settings when restoring the partition, 1022/254/63. So why am I seeing 1022 here and there, and not 1023?
Second question:
Here is my partition table AFTER a restore (of partition 2):
+====+====+=============+====+=============+=============+=============+
| 0: | 00 | 0000 032 33 | 27 | 1023 254 63 | 2048 | 33554432 |
| 1: | 80 | 1023 254 63 | 07 | 1023 254 63 | 33556480 | 409600 |
| 2: | 00 | 1023 074 09 | 07 | 1023 254 63 | 33966080 | 127815680 |
| 3: | 00 | 1023 254 63 | 07 | 1023 254 63 | 161781760 | 463357952 |
+====+====+=============+====+=============+=============+=============+
As you can see, according to CHS, Partition 2 now starts BEFORE partition 1 ends. What is IFW trying to accomplish here? I've tried all variations of settings in IFW, I CANNOT get it to stop messing about with geometry; it refuses to restore the starting CHS to 1023/254/63 - So I am curious as to what we are trying to do here with 1023/74/9...
Thank you.
Best Regards,
Today's questions are related to the handling of drive geometry by IFW. I know, nothing uses geometry anymore, but I am still worried about it. PS: Why is BBCode disabled? I had to edit the tables below because [code][/code] doesn't work :-(
First question:
Geometry is set to the standard "too big" value of 1023/254/63 for most of my partitions, which is normal since even maximum C*H*S is below the LBA values for the partitions, so we end-up with the industry standard. However, I have noticed that sometimes IFW will present me with a C value of 1022 instead of 1023. Even PartInfo shows this:
MBR Partition Information (HD0 - 0x1B40FA96)
(CHS: 1022/254/63) (WCHS: 38913/255/63)
+====+====+=============+====+=============+=============+=============+
| 0: | 00 | 0000 032 33 | 27 | 1023 254 63 | 2048 | 33554432 |
| 1: | 80 | 1023 254 63 | 07 | 1023 254 63 | 33556480 | 409600 |
| 2: | 00 | 1023 254 63 | 07 | 1023 254 63 | 33966080 | 127815680 |
| 3: | 00 | 1023 254 63 | 07 | 1023 254 63 | 161781760 | 463357952 |
+====+====+=============+====+=============+=============+=============+
As you can see, most of the "C" values are at maximum 1023, but see above the partition listing, in the header of the table -> (CHS: 1022/254/63). Shouldn't this be 1023/254/63? I see 1022 also in IFW: If I select to make a backup in IFW, and in the partition selection screen I highlight partition 2 and click "Information" button, it shows CHS as 1022/254/63; the same "bug" appears in Geometry settings when restoring the partition, 1022/254/63. So why am I seeing 1022 here and there, and not 1023?
Second question:
Here is my partition table AFTER a restore (of partition 2):
+====+====+=============+====+=============+=============+=============+
| 0: | 00 | 0000 032 33 | 27 | 1023 254 63 | 2048 | 33554432 |
| 1: | 80 | 1023 254 63 | 07 | 1023 254 63 | 33556480 | 409600 |
| 2: | 00 | 1023 074 09 | 07 | 1023 254 63 | 33966080 | 127815680 |
| 3: | 00 | 1023 254 63 | 07 | 1023 254 63 | 161781760 | 463357952 |
+====+====+=============+====+=============+=============+=============+
As you can see, according to CHS, Partition 2 now starts BEFORE partition 1 ends. What is IFW trying to accomplish here? I've tried all variations of settings in IFW, I CANNOT get it to stop messing about with geometry; it refuses to restore the starting CHS to 1023/254/63 - So I am curious as to what we are trying to do here with 1023/74/9...
Thank you.
Best Regards,