c++ - Volume to physical drive -

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querydosdevice(l"e:", devicename, max_path);

(e: sd card)

devicename "\device\harddiskvolume3"

how "convert" "\\.\physicaldrive1"

volumes made of 1 or more partitions, reside on disks. so, e: doesn't map single disk in system (think software raid).

the way map volumes physicaldrive names in win32 first open volume , send ioctl_volume_get_volume_disk_extents. give structure has 1 disk_extent entry every partition volume spans:

typedef struct _volume_disk_extents {   dword       numberofdiskextents;   disk_extent extents[anysize_array]; } volume_disk_extents, *pvolume_disk_extents;

the extents have disk number in them:

typedef struct _disk_extent {   dword         disknumber;   large_integer startingoffset;   large_integer extentlength; } disk_extent, *pdisk_extent;

the disknumber goes phsyicaldrivex link, can sprintf number "\\.\physicaldrive%d"

-scott


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