Fujitsu MHK2090AT, MHK2120AT, MHK2060AT Logical address, Address translation example in CHS mode

Operations

6.2.2 Logical address

(1) CHS mode

Logical address assignment starts from physical cylinder (PC) 0, physical head (PH) 0, and physical sector (PS) 1 and is assigned by calculating the number of sectors per track that is specified by the INITIALIZE DEVICE PARAMETERS command. If the last sector of a physical track is used, the track is switched and the next logical sector is placed in the initial sector of the subsequent physical track.

Figure 6.5 shows an example of 6 heads configuration. (assuming there is no track skew).

Physical sector

1 2 3

Physical cylinder 0

LS1

Physical head 0

LH0

Physical sector

62	63	64		126		127	504		505	506
	LS				LS	LS1		LS	LS1	LS2
	63				63			63
			LH1						LH8

1		2		61		62
Physical cylinder 1	LS3LS4				LS	LS1LS2
Physical head 0
					63
			LH8				LH9

ex: Zone 0 in 6-head device

Physical parameter

–Physical head: 0 to 5

–Physical sector: 1 to 506

Specification of INITIALIZE DEVICE PARAMETERS command

–Logical head: 0 to 15

–Logical sector: 1 to 63

Figure 6.5 Address translation (example in CHS mode)

6-8 C141-E088-01EN