![](/images/new-backgrounds/1170239/170239257x1.webp)
4.6 Packet Commands
Table 4.74 Block descriptor
Bit | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
Byte |
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0 |
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| Density Code (00h) |
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| Number of Block |
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4 |
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| Reserved |
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| Block Length |
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Each field value of the Block Descriptor is validated only when the accessible media is inserted. If not, 0 is returned.
Table 4.75 shows the mode page format.
Table 4.75 Mode Page Format
Bit | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
Byte |
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0 | PS | 0 |
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| Page Code |
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1 |
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| Page length |
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| Reserved |
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A value of 1 in PS indicates that the page descriptor can be saved on the Flash ROM.
4.6.7 MODE SENSE (10) command
Table 4.76 MODE SENSE (10) command
Bit | 7 |
| 6 |
| 5 |
| 4 |
| 3 |
| 2 | 1 | 0 |
Byte |
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0 |
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| Operation Code (5Ah) |
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1 |
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| Reserved |
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| DBD |
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| Reserved |
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2 | PC |
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| Page Code |
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| Allocation length |
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| Reserved |
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