SDHC Card

SDHC - Secure Digital High Capacity is a flash memory card that can store data up to 32 GB. These cards are types of removal memory device, which can be used in many digital devices, include iPod, Digital cameras and mobile phones and so on. It belongs to family of SD cards. After the release of Mini SD card, SDHC cards came into market to meet requirements of technology in storing huge data.

SDHC is purposely designed to meet the levels of storage capacity, safety, performance and small form factor necessities in recently emerging audio and video end user electronic devices. Based on dual channel technology and high quality SLC (Single Level Cell) NAND flash chip, TS4GSDHC150 is the ideal cohort to bring out the mainly from your high-performance electronic devices.

The SD memory card association has created and specified 3 speed classes to help you in identifying speed and performance capabilities or minimum necessities of SD and SDHC cards and the host products. The SD Speed Class Ratings indicate a minimum constant write speed for SDHC cards:

  • Class 2: 2 MB/sec
  • Class 4: 4 MB/sec
  • Class 6: 6 MB/sec
  • Class 10: 10 MB/sec

SDHC cards in advanced classes can transfer data more speedily in most of the cases, although this speed depends on the card reader. The classes are defined by the minimum DTS but not the maximum, and the user may get better performance as expected. It is the finest for the user to test the writing speed of his memory device and use the suggested class, however, because this performance might be dangerous for users.

File system of SDHC

All flash memory cards belongs to SD family is a block addressable storage device in which the host device can easily read and write fixed size blocks by identifying their block number. Most SD family cards are available with one or more MBR partitions, the first one or only partition contains the file system. This lets them operate like the hard disk drive of a computer. SDHC card are formatted with MBR and the following file system:

  • Capacity of less than 16450560 logical sectors (smaller than 7.8 GB): FAT32 with partition type 0Bh and EBPB 7.1
  • Capacity of at least 16450560 logical sectors (larger than 7.8 GB): FAT32X with partition type 0Ch and EBPB 7.1

Salient features of SDHC memory card are:

  • Card Lid material: PC + ABS
  • Operating Voltage: 2.7 ~ 3.6V
  • Operating Temperature: 25 ~ 85°C
  • Durability: 10,000 insertion/removal cycles
  • companionable with SD Specification Ver. 2.0
  • Comply with SD File System Specification Ver. 2.0
  • Mechanical Write Protection Switch
  • Supports Speed Class Specification up to Class 6
  • Supports Copy Protection for Recorded Media (CPRM)
  • for SD-Audio
  • Support SD command class 0,2,4,5,7,8
  • Form Factor: 24mm x 32mm x 2.1mm

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