NV Cache
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| Header Cell - Column 0 | 128 MB | 256 MB | 1 GB |
|---|---|---|---|
| H-HDD Firmware | ~ 10 MB | ~ 10 MB | ~ 24 MB |
| Write Cache | 32 MB | 32 MB | 32 MB |
| OEM Pinned Data | 15 MB | 79 MB | 463 MB |
| SuperFetch Data | Remainder | Remainder | Remainder |
When configured in multiple channels, SLC Flash memory performance can outperform mechanical hard drives in any aspect, but these configurations are expensive - we expect the first hybrid hard drives to deliver sustained transfer rates of up to 30 MB/s for the Flash memory. While 2.5" hard drives exceed 50 MB/s, this is still more than enough, as Flash memory does not suffer from long access times.
Microsoft has minimum performance requirements for H-HDDs, and Vista will automatically determine a H-HDD's performance once detected.
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| Scenario | Sustained throughput (MB/second) |
|---|---|
| 4 kb random reads to a file pinned in the NV cache | >4 |
| 4 kb random writes to a file pinned in the NV cache | >4 |
| 64 kb sequential reads to a file pinned in the NV cache | >16 |
| 64 kb sequential writes to a file pinned in the NV cache | >8 |
Source: "Windows PC Accelerators" paper by Microsoft.
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