Storage devices & Power supply

Controller:
Controller chip that control how HD operate.

HBA: Host
to host bus adapter : Converting signal from the controller to the computer.

Anatomy of Hard
Drive

**C/H/S: Cylinder/head/Sector**

**Cylinder X Head = Tracks**

**Tracks X Sector per track = Total Sector**

**HDD speed: 5400/7200/10 000/12 000**

**SSD: Solid state drive**

**Hybrid drive: Dual (HD + SSD) often used data**
is transferred to the ssd part for faster access.

**Solid Stade hybrid drive: HDD with NAND chip on**
board

**SRT: Smart response technology: Use caching for**
popular data on the faster drive in a dual drive scenario.

**-SL**
= Single layer                             -DL
= Dual layer

* **CD                                                         650/700/800/900**

MB

* **DVD +/-R/RW                   SS,SL                     4.7GB**
* **DVD -R/+R                         SS,SL                     8.55GB**
* **BD -R/RE                             SS,SL                     25GB**
* **BD -R/RE                             SS,DL                    50GB**
* **BD -R/RE                             DS,DL                    100GB**

### **Optical drive data rate**

**CD-ROM                              1X = 150 KBps**

**2X**
= 300 KBps

**8X**
= 1.2 MBps

**(Multiplier**
by data buffering)

**16X/32X/52X**

**DVD                                      1X = 1.4**
MBps

**16X**
max speed

**BD                                          1X =**
4.5 MBps  (30X the speed of cd 1X)

**2X**
needed for commercial video playback

**DVD ROM : Data encoded is unchangeable**

**DVD -R/+R: Write once**

**DVD -RW/+RW: Multiplies use**

**IDE PATA: Legacy**

**SATA 1 : 1.5 Gbps            sata 150**

**SATA 2 : 3 Gbps               sata**
300

**SATA 3 : 6 Gbps               sata**
600

### **RAID: Redundant Array of independent disk**

* **Raid**

0 : Disk stripping

* **Raid**

1 : Disk Mirroring

* **Raid**

5 : Redundancy with parity + speed

* **Raid**

6 : Like 5 but it can loose 2 disk

* **Raid**

10: 1+0 OR 0+1 (Minimum 4 disk, 50% loss for redundancy)

### **Sequential tape format**

* **QID                        Quarter inch cartridge                  200Kb to 1GB**
* **DLT                        Digital line tape                              Up to 800 GB**
* **Data8/exabyte Eight millimetre                             Up to 60 GB**
* **DAT/DSS              Digital audio tape                           Up to 300 GB**
* **LTO                        Linear Tape-Open                          up to 2.5 TB**

### **Memory card format**

* **SD                          Secure Digital                                   32X24 mm**
* **MiniSD                                                                               21.5X20**

mm

* **MicroSD                                                                             15X11**

mm

* **CF                           Compact Flash                                 36X43 mm**
* **XD-Picture**

card                                                               20X25 mm

**AT power connector = Depreciated**

**MOLEX: Standard peripheral power connector**

**ATX power connector: Single 20 pin connector**

**ATX 12v: Needed for PCIe 4/6/8 pin**

**EPS12v**