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\begin{tikzpicture}[ mem/.style={
draw=lightGray,
top color=lightGray,
bottom color=white,
rounded rectangle,
shading=axis,
minimum width=2cm,
},
plain/.style={
draw=none,
},
arrow/.style={
thick,
decoration={
markings,
mark=at position 1 with {\arrow[semithick]{open triangle 60}}
},
double distance=1.4pt, shorten >= 5.5pt,
preaction = {decorate},
postaction = {draw,line width=1.4pt, white,shorten >= 4.5pt}
},
]
\node at (0, 2) [mem] (hdd) {HDD};
\node[below=12pt of hdd, mem] (ssd) {SSD};
\node[below=12pt of ssd, mem] (ram) {RAM};
\node[below=12pt of ram, mem] (cache) {Cache};
\node[below=12pt of cache, mem] (register) {Register};
\node[left=6pt of hdd, plain] {TB};
\node[left=6pt of ssd, plain] {GB};
\node[left=6pt of ram, plain] {GB};
\node[left=6pt of cache, plain] {MB};
\node[left=6pt of register, plain] {bits};
\node[right=6pt of hdd, plain] {persistent};
\node[right=6pt of ssd, plain] {persistent};
\node[right=6pt of ram, plain] {volatile};
\node[right=6pt of cache, plain] {volatile};
\node[right=6pt of register, plain] {volatile};
\draw[arrow]
($ (current bounding box.south west) + (-0.5,0) $) --
(current bounding box.north west);
\draw[arrow]
($ (current bounding box.north east) + (0.5,0) $) --
(current bounding box.south east);
\node[above=0pt of current bounding box.north west] {largest};
\node[below=0pt of current bounding box.south east] {fastest};
\end{tikzpicture}
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