Samsung MZ-V6E1T0 Uživatelský manuál stáhnout pdf (Strana 2)

A flurry of new standards activity has opened a wide range of choices for solid-state drives

(SSDs). Client devices are adopting new approaches quickly to gain advantages in density

and performance. Evaluating the technology choices in a sea of acronyms – including AHCI,

HHHL AIC, M.2, mSATA, NVMe, U.2, and V-NAND – means exploring three issues: form factors,

interfaces, and software support. Aligning the latest technology onboard, M.2 SSDs free users

from limits of earlier generations.

mSATA was developed

specifically for SSD modules,

borrowing its 51x30mm low-

profile outline from the PCI

Express (PCIe) Mini Card form

factor popular in laptops.

For compatibility with more

systems, mSATA replaced the

PCIe interface with SATA 3.0,

but users have already run

into performance limits. Three

other form factors for SSDs

have turned to PCIe to deliver

performance users want.

2.5” drives with the new U.2

(formerly SFF-8639) connector

are well suited for enterprise

drive farms with PCIe, SATA,

or SAS controllers. In hot-

swappable, front-removable

applications, 2.5” drives with

U.2 connectors work well. Client

devices can cable PCIe slots to

a 2.5” U.2-enabled drive with an

adapter.

PCIe Half-Height, Half-Length

Add-In Card (HHHL AIC)

provides PCIe interface speeds

on a relatively large 167x111mm

card. These are simple to

install in a PCIe slot, but resting

perpendicular to a backplane or

riser card the overall system size

ends up more suited for servers

than for clients.

All three approaches – mSATA,

2.5” drives with U.2 connectors,

and PCIe HHHL AIC – are

space-inefficient for today’s

client devices. Thin, compact

platforms such as tablets, 2-in-

1s, game consoles, and NUC-

like machines present a new

challenge. Succeeding mSATA,

which achieves density but lacks

performance, is a new

specification released at the end

of 2013: M.2.

M.2 modules provide more

choice of sizes and interfaces,

at typically less than 1/10 the

weight of a 2.5” hard drive.

Optimized and larger layouts

give M.2 more capacity than

mSATA modules. Available PCIe,

SATA, USB, and other interfaces

support many functions –

including Wi-Fi, Bluetooth, 4G

LTE modems, and SSDs, making

the M.2 form factor versatile and

increasingly popular.

M.2 SSDS: ALIGNED FOR SPEED

FOUR FORM

FACTORS IN PLAY

PCIe HHHL AIC

2.5” with U.2

mSATA

M.2

Form factor L (mm) W (mm) H (mm) Interfaces

M.2 16-110 12-30 2.2-4.2 PCIe, SATA, USB

mSATA 51 30 3.8 SATA

2.5” with U.2 100 70 9-19 PCIe, SATA, USB

PCIe HHHL AIC 167 111 19 PCIe

1 2 3 4 5 6

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