PATA (parallel advance technology attachment)
- 40 pins data cable connector.
- Maximum four hard disk can be connected.
- Single cable can connected two devices.
- RPM 5400 to 7200 (platter rotation speed).
- Data transfer speed = 140 to 150 mbps.
Disadvantages
- Older PATA adapters will limit transfer rates according to the slower attached device (debatable)
- Only ONE device on the PATA cable is able to read/write at one time
- Limited standard for cable length (up to 18inches/46cm)
Advantages
- Low costs
- Large capacity
SATA (serial advance technology attachment)
- 7 pin data cable connector.
- Maximum 4 hard disk device can be connected.
- Single cable can connect single device.
- RPM speed up to 100000.
- Data transfer speed= 150 to 160 mbps.
Disadvantages
- Slower transfer rates compared to SCSI
- Not supported in older systems without the use of additional components
Advantages
- Low costs
- Large capacity
- Faster transfer rates compared to ATA (difference is marginal at times though)
- Smaller cables for better heat dissipation
SCSI (small computer system interface)
- 50 to 68 pin data cable connector.
- It needs a SCSI card
- Connect the hard disk device in chain method.
- RPM speed up to 15000
- Data transfer rate speed= 320 mbps
Disadvantages
- Costs
- Not widely supported
- Many, many different kinds of SCSI interfaces
- SCSI drives have a higher RPM, creating more noise and heat
Advantages
- Faster
- Wide range of applications
- Better scalability and flexibility in Arrays (RAID)
- Backward compatible with older SCSI devices
- Better for storing and moving large amounts of data
- Tailor made for 24/7 operations
- Reliability
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