Table of Content
- IDE / ATA
- EIDE / ATA2
- Ultra ATA / Ultra DMA
- SCSI (Small Computer Systems Interface)
- Serial Storage Architecture (SSA)
- Fibre Channel
- Serial ATA
- Storage Area Network (SAN) / Network Attached Storage (NAS)
IDE / ATA
- Electronic controller card built into the hard drive itself
- Two channels with a maximum of two disk drives per channel (one designated as Master and the other as Slave)
- Uses 40-pin cable
- LImited to 18 inches in cable length, using parallel data transfer
EIDE / ATA2
- Same general layout of IDE, but can achieve faster data transfer rates due to increases in technology
Ultra ATA / Ultra DMA
- Improves performance by using Direct Memory Access (DMA) to allow the drive to access main memory without involving the processor
- Connector heads for Ultra ATA cables are typically in blue to distinguish it from a IDE/EIDE cable
SCSI (Small Computer Systems Interface)
- Pronounced "skuzzy"
- More flexible and efficient
- More devices can be connected; externally or internally
- SCSI devices needing to transfer data between itself can be handled by SCSI controller, the CPU need not be involved
- Uses a host adapter to improve performance and allow more devices to connect both internally and externally
- Both ends of the SCSI chain must be terminated
- Three main standards
- SCSI-1 (aka Narrow SCSI)
- Adopted in 1984
- 8-bit wide bus
- 5Mbps transfer rate
- 7 devices can be attached to the same cable
- 6 meter maximum cable length
- SCSI-2
- Adopted in 1994
- 8- (Fast SCSI -2) and 16-bit (Wide SCSI-2) bus
- 20Mbps transfer rate
- 15 devices can be attached to the same cable
- 25 meter maximum cable length
- SCSI-3 (aka Ultra SCSI)
- Adopted in 1998
- 16-bit wide bus
- 300+Mbps transfer rate
- 15 devices can be attached to the same cable
- 25 meter maximum cable length
- Ultra3 Wide SCSI
- 16-bit wide bus
- 80 MB/s
- 15 devices can be attached to the same cable
- 25 meter maximum cable length
- Ultra3 SCSI (aka, Ultra-160, Fast-80 Wide)
- 16-bit wide bus
- 160 MB/s
- 15 devices can be attached to the same cable
- SCSI-1 (aka Narrow SCSI)
Serial Storage Architecture (SSA)
- Invented in 1990 by IBM
- Can support 192 hot swappable drives
- Supports full-duplex communication at over 40Mbps per channel
- Replaced by Fibre Channel
Fibre Channel
- Introduced in 1988
- Allows hundreds of devices to be connected through a loop
- Original version had data transfer rate of 12.5 Mbps
- 128GFC "Gen6" introduced in 2016 offers data transfer rate of 12.8 Gbps
- Active development expected to continue through 2022
Serial ATA
- Uses 4 wires to carry a serial (one bit at a time) signal through the cable. This allow for more flexibility and longer cables as well as faster data transfer
- Data cable is 7-pin
- Generations:
- SATA/150 (aka SATA1) - first generation, 1.5 Gb/s
- SATA/300 - 3.0 Gb/s
Storage Area Network (SAN) / Network Attached Storage (NAS)
- Use the network and even the Internet to access data that is stored for the client in large "server farms"
Suggestion
Very comprehensive easy format to follow.
Suggestion
Perfect introduction to Python for someone already familiar with another programming language
