MD1665-D64-J SanDisk, MD1665-D64-J Datasheet - Page 10

• Manufacturer Part Number: MD1665-D64-J
• Description: UDOC FLASH DISK 64MB
• Manufacturer: SanDisk

Specifications of MD1665-D64-J

• Memory Type: FLASH - Nand
• Memory Size: 64MB
• Package / Case: Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Speed: -

4.
4.1
M-Systems’ patented TrueFFS technology was designed to maximize the benefits of flash memory
while overcoming inherent flash limitations that would otherwise reduce its performance, reliability,
and lifetime. TrueFFS emulates a hard disk, making flash management completely transparent to
the OS.
TrueFFS, which has become an industry standard for reliability, is implemented in uDiskOnChip,
therefore no integration is required.
TrueFFS technology features:
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4.2
Since NAND flash is an imperfect storage media, it can contain bad blocks that cannot be used for
storage because of their high error rates. TrueFFS automatically detects and maps out bad blocks
upon system initialization, ensuring that they are not used for storage. This management process is
completely transparent to the user, who is unaware of the existence and location of bad blocks,
while remaining confident of the integrity of data stored.
10
Flash file system management
Bad-block management
Dynamic virtual mapping
Dynamic and static wear-leveling
Power failure management
Implementation of MLC-tailored EDC/ECC
Performance optimization
T
Overview
Bad-Block Management
RUE
FFS T
ECHNOLOGY
Figure 3: TrueFFS Implemented in uDiskOnChip Firmware
uDiskOnChip Data Sheet, Rev. 2.2
OS File System
uDiskOnChip
Application
TrueFFS
94-SR-003-01-8L