4.1.9. Endurance
The FFD supports more than 5,000,000 erase cycles and an unlimited number of read cycles,
enhanced by the following features:
•
Dynamic Wear-Leveling Algorithm
: This algorithm eliminates situations where the
application repeatedly writes to the same physical location until its flash components wear
out. The dynamic wear leveling algorithm applies virtual mapping of logical sectors to
physical blocks and is completely transparent to the customer application.
•
Garbage Collection Process
: This process eliminates the need to perform an erase
operation prior to every write operation, which eliminates excessive disk deterioration.
Additionally, the garbage collection process accumulates data considered necessary for
erasure until the block is full.
•
EDC/ECC (Error Detection Code/Error Correction Code)
: The FFD has embedded error
detection and error correction hardware and software mechanisms. The EDC/ECC uses the
BCH algorithm, which can detect up to 5 errors in 512 bytes of data, and correct up to 4
errors.
•
Bad-Block Mapping Algorithm
: This algorithm replaces bad blocks with new blocks from
available spares.
4.1.10. Physical
Characteristics
4.1.10.1 Weight
The weight of the FFD conforms to the values defined in Table 5.
Table 5: FFD 3.5” Ultra320 SCSI Weight
Memory Capacity (GB)
Case Height (in)
Maximum Weight (g)
1 – 8
0.5
25
12 – 64
0.5
275
72 – 112
1
415
120 – 160
1
480
168 – 176
1
525
192 – 224
1
415
240 – 320
1
480
336 – 352
1
525
12
Product Specification and User Manual FFD 3.5" Ultra320 SCSI
43-PS-0305-00 Rev. 2.0
