Maxtor FIREBALL3 Service Manual download pdf (Page 12)

Product Description

Maxtor Fireball3 2-3

Sector Address Translation

All Maxtor hard drives feature a universal translate mode. In an AT/EISA-class

system, the drive may be configured to any specified combination of cylinders,

heads and sectors (within the range of the drive's formatted capacity). Maxtor hard

drives power-up in a translate mode:

Logical Block Addressing

The Logical Block Address (LBA) mode can only be utilized in systems that support

this form of translation. The cylinder, head and sector geometry of the drive, as

presented to the host, differs from the actual physical geometry. The host AT

computer may access a drive of set parameters: number of cylinders, heads and

sectors per track, plus cylinder, head and sector addresses. However, the drive can’t

use these host parameters directly because of zoned recording techniques. The drive

translates the host parameters to a set of logical internal addresses for data access.

The host drive geometry parameters are mapped into an LBA based on this formula:

LBA = (HSCA - 1) + HHDA x HSPT + HNHD x HSPT x HCYA

= (HSCA - 1) + HSPT x (HHDA + HNHD x HCYA)

where HSCA = Host Sector Address, HHDA = Host Head Address

HCYA = Host Cylinder Address, HNHD = Host Number of Heads

HSPT = Host Sectors per Track

The LBA is checked for violating the drive capacity. If it does not, the LBA is

converted to physical drive cylinder, head and sector values. The physical address is

then used to access or store the data on the disk and for other drive related

operations.

Defect Management Zone (DMZ)

Each drive model has a fixed number of spare sectors per drive, all of which are

located at the end of the drive. Upon detection of a bad sector that has been

reassigned, the next sequential sector is used.

For example, if sector 3 is flagged, data that would have been stored there is “pushed

down” and recorded in sector 4. Sector 4 then effectively becomes sector 3, as

sequential sectors are “pushed down” across the entire drive. The first spare sector

makes up for the loss of sector 3, and so maintains the sequential order of data. This

push down method assures maximum performance.

On-the-Fly Hardware Error Correction Code (ECC)

>24 symbols, single burst, guaranteed

MODELS CYL HD SPT MAX LBA CAPACITY

2F020J0/L0 40,395 16 63 40,718,160 20GB

2F030J0/L0 59,582 16 63 60,058,656 30GB

2F040J0/L0 79,656 16 63 80,293,248 40GB

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 54 55

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Maxtor FIREBALL3 Service Manual Page 12