111
011
01
0
PLANE 0
PLANE 1
PLANE 2
PLANE 3
REG
REG
REG
REG
Data Register
4 KB
Page Size
4 KB
Block
PLANE
0
Size
PLANE 1
RPlane
EG
REG
256
KB 3
PLANE
EG
REG 512RMB
Die Size
2 GB
Erase Cycles
100K
Page Read
25μs
Page Program
DIE 0
PLANE 2
’09?
200μs
Serial Access
100μs
20μs
Block Erase
1.5ms
DIE 1
MLC (multiple bits in cell):
slower, less durable
Block(P)
P
P
P0
P1
Page(P)
Page(Q)
P
Q
P
P0
Q0
P1
Page(P)
Page(Q)
Page(R)
P
Q
R
P Q R
P0
Q0
R0
P0 Q0 R0
without free info
with free info
300
250
200
150
100
50
0
5K
6K
7K
8K
REG
REG
DIE 0
REG
REG
REG
REG
DIE 1
REG
REG
Controller
08
16 24
32 40
19
17 25
33 41
2 10
18 26
34 42
3 11
19 27
35 43
4 12
20 28
36 44
5 13
21 29
37 45
6 14
22 30
38 46
7 15
23 31
39 47
REG
REG
DIE 0
REG
REG
REG
REG
DIE 1
REG
REG
REG
REG
REG
REG
Shared-bus gang
Shared-control gang
With faster serial connect, intrachip ops are less important
Block Allocation
Active use
Over-provisioning
Worn out
Block Allocation
Active use
Over-provisioning
Worn-out
Block Allocation
Active use
Over-provisioning
Worn-out
Expiry Meter
for block A
Cold content
Block B
Block A
Q R
P Q R
Q0 R0
P0 Q0 R0
IfIfIfRemaining(A)
Remaining(A)<>=
<Throttle-Threshold,
Migrate-Threshold,
Remaining(A)
Migrate-Threshold,
reduce
probability
cleaning
A A
clean
A, but
migrate
data into
clean of
Acold
≠
http://research.microsoft.com/users/
vijayanp/papers/ssd-usenix08.pdf
http://research.microsoft.com/downloads
© 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market
conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation.
MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.