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1.3GB IPI Disk Drive

Physical and Logical Geometry

The 1.3GB IPI Disk Drive uses Zone Bit Recording (ZBR). The outer tracks have a higher bit density than the inner tracks.

The defect list for the 1.3GB IPI Disk Drive is in physical block number. Errors reported under the operating system format utility are in logical block number. Block numbers converted to cylinder/head/sector by the show command, are in logical block number.

The analyze command performs the conversion from logical to physical block when a defect is detected.

The repair command does not perform the conversion from a logical block number to a physical block number. Do not enter the logical block when using the repair command.

To add a defect to the defect list, first convert the logical block number to a physical block number. Then, use the add command to enter the physical block number into the defect list. Do not enter the logical block number when using the add command.

Use the Disk Drive Logical Geometry chart to find Zone, First Block in Zone, First Cylinder in Zone, Cylinder Size of Zone, and Track Size of Zone.

Example: error reported on block 1000000.

LBN = 1000000
Zone = 2
First Block in Zone 2 = 929526
First Cylinder in Zone 2 = 701
Cylinder Size of Zone 2 = 1292
Track Size of Zone 2 = 76

1.3GB IPI Disk Drive Logical Geometry

ZONE	FIRST CYL	LAST CYL	FIRST BLOCK	FIRST C/H/S	LAST BLOCK	LAST C/H/S	TRK SIZE	CYL SIZE
0	0	625	0	0/0/0	830075	625/16/77	78	1326
1	626	700	830076	626/0/0	929525	700/16/77	78	1326
2	701	800	929526	701/0/0	1058725	798/7/31	76	1292
3	801	925	1058726	798/7/32	1215975	917/0/33	74	1258
4	926	1050	1215976	917/0/34	1368975	1032/6/75	72	1224
5	1051	1175	1368976	1032/6/76	1521975	1147/13/39	72	1224
6	1176	1300	1521976	1147/13/40	1670725	1259/16/43	70	1190
7	1301	1400	1670726	1259/16/44	1786325	1347/2/47	68	1156
8	1401	1500	1786326	1347/2/48	1898525	1431/13/5	66	1122
9	1501	1600	1898526	1431/13/6	2007325	1513/13/73	64	1088
10	1601	1800	2007326	1513/13/74	2218125	1672/13/39	62	1054
11	1801	1900	2218126	1672/13/40	2320125	1749/12/15	60	1020
12	1901	2000	2320126	1749/12/16	2418725	1824/1/23	58	986
13	2001	2100	2418726	1824/1/24	2512769	1894/16/77	58	986

1.3GB IPI Disk Drive Physical Geometry

ZONE	FIRST CYL	LAST CYL	BYTES / TRACK	SECTORS	BYTES/ SECTORS	CDT 2
0	0	625	50399	40	1230	46
1	626	700	49559	40	1226	45
2	701	800	48719	39	1225	44
3	801	925	47039	38	1221	43
4	926	1050	46199	37	1220	42
5	1051	1175	45359	37	1219	41
6	1176	1300	43679	36	1212	40
7	1301	1400	42839	35	2111	39
8	1401	1500	41159	34	1210	38
9	1501	1600	40319	33	1206	37
10	1601	1800	38639	32	1201	35
11	1801	1900	37799	31	1201	35
12	1901	2000	36959	30	1197	34
13	2001	2100	36119	30	1196	33

Longhand Conversion of Physical to Logical Block

LBN - First Block = LB

1000000 - 929526 = 70474

To find the Physical Cylinder

First Cylinder + (LB ÷ Cylinder Size in blocks) = Pcylinder
701 + (70474 ÷ 1292) = 755 (discard the remainder)

To find the Physical Head

To find the Physical Sector

The function of the Modulus Operator % is to give the remainder of the first value divided by the second value.

Calculator Conversion of Physical to Logical Block

LBN - First Block = LB

1000000 - 929526 = 70474

To find the Physical Cylinder

First Cylinder + (LB ÷ Cylinder Size in blocks) = Pcylinder

701 + (70474 ÷ 1292) = Pcylinder
701 + (54.54644) = 755.54644
755 = Pcylinder (0.54644 = Pcylinder remainder)

To find the Physical Head

(Pcylinder remainder × Cylinder size) ÷ Track Size = Phead

(0.54644 × 1292) ÷ 76 = Phead
(706.00048) ÷ 76 = 9.28948
9 = Phead (0.28948 = Phead remainder)

To find the Physical Sector

Phead remainder × Track Size = Psector

0.28948 × 76 = Psector
0.28948 × 76 = 22.00048
22 = Psector

Logical block 1000000 is located at physical cylinder 755, head 9, sector 22. Add the physical block number to the defect list.

The show command reports that logical block 1000000 is located at logical cylinder 754, head 2, sector 40. Do not add the logical block number to the defect list.

Last updated: December 2, 1996


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