[Sprint HTC One (M7)] -viperboy-:
Got my One from HTC, dev unlocked, and am already underway :D Here is some useful info for devs...

shell@android:/ $ cat /proc/emmc

dev: size erasesize name
mmcblk0p19: 000ffa00 00000200 "misc"
mmcblk0p36: 00fffe00 00000200 "recovery"
mmcblk0p35: 01000000 00000200 "boot"
mmcblk0p37: 73fffc00 00000200 "system"
mmcblk0p26: 00140200 00000200 "local"
mmcblk0p38: 27fffe00 00000200 "cache"
mmcblk0p39: 680000000 00000200 "userdata"
mmcblk0p22: 01400000 00000200 "devlog"
mmcblk0p24: 00040000 00000200 "pdata"
mmcblk0p27: 00010000 00000200 "extra"
mmcblk0p33: 04b00200 00000200 "radio"
mmcblk0p16: 03c00400 00000200 "adsp"
mmcblk0p15: 00100000 00000200 "dsps"
mmcblk0p17: 007ffa00 00000200 "radio_config"
mmcblk0p20: 00400000 00000200 "modem_st1"
mmcblk0p21: 00400000 00000200 "modem_st2"
mmcblk0p29: 00040000 00000200 "skylink"
mmcblk0p30: 01900000 00000200 "carrier"
mmcblk0p28: 00100000 00000200 "cdma_record"
mmcblk0p18: 02000000 00000200 "reserve_1"
mmcblk0p32: 034ffa00 00000200 "reserve_2"
mmcblk0p34: 05fffc00 00000200 "reserve_3"
mmcblk0p31: 04729a00 00000200 "reserve"

shell@android:/ $ cat /proc/partitions ls -la /dev/block/platform/dw_mmc/by-name

major minor #blocks name

179 0 30535680 mmcblk0
179 1 128 mmcblk0p1
179 2 256 mmcblk0p2
179 3 130671 mmcblk0p3
179 4 1 mmcblk0p4
179 5 16 mmcblk0p5
179 6 256 mmcblk0p6
179 7 15577 mmcblk0p7
179 8 256 mmcblk0p8
179 9 1024 mmcblk0p9
179 10 256 mmcblk0p10
179 11 2048 mmcblk0p11
179 12 2080 mmcblk0p12
179 13 5120 mmcblk0p13
179 14 1024 mmcblk0p14
179 15 1024 mmcblk0p15
179 16 61441 mmcblk0p16
179 17 8190 mmcblk0p17
179 18 32768 mmcblk0p18
179 19 1022 mmcblk0p19
179 20 4096 mmcblk0p20
179 21 4096 mmcblk0p21
179 22 20480 mmcblk0p22
179 23 4 mmcblk0p23
179 24 256 mmcblk0p24
179 25 16 mmcblk0p25
179 26 1280 mmcblk0p26
179 27 64 mmcblk0p27
179 28 1024 mmcblk0p28
179 29 256 mmcblk0p29
179 30 25600 mmcblk0p30
179 31 72870 mmcblk0p31
179 32 54270 mmcblk0p32
179 33 76800 mmcblk0p33
179 34 98303 mmcblk0p34
179 35 16384 mmcblk0p35
179 36 16383 mmcblk0p36
179 37 1900543 mmcblk0p37
179 38 655359 mmcblk0p38
179 39 27262976 mmcblk0p39

root@android:/ # fdisk -l /dev/block/mmcblk0
Warning: deleting partitions after 60

Disk /dev/block/mmcblk0: 31.2 GB, 31268536320 bytes
1 heads, 16 sectors/track, 3816960 cylinders
Units = cylinders of 16 * 512 = 8192 bytes

Device Boot Start End Blocks Id System
/dev/block/mmcblk0p1 * 1 17 128 4d Unknown
Partition 1 does not end on cylinder boundary
/dev/block/mmcblk0p2 17 49 256 51 Unknown
Partition 2 does not end on cylinder boundary
/dev/block/mmcblk0p3 49 16382 130671 5d Unknown
Partition 3 does not end on cylinder boundary
/dev/block/mmcblk0p4 16382 3816960 30404624 5 Extended
Partition 4 does not end on cylinder boundary
/dev/block/mmcblk0p5 16383 16384 16 5a Unknown
/dev/block/mmcblk0p6 16385 16417 256 73 Unknown
/dev/block/mmcblk0p7 16417 18364 15577+ 5b Unknown
/dev/block/mmcblk0p8 18364 18396 256 5c Unknown
/dev/block/mmcblk0p9 18396 18524 1024 45 Unknown
/dev/block/mmcblk0p10 18524 18556 256 47 Unknown
/dev/block/mmcblk0p11 18556 18812 2048 46 Unknown
/dev/block/mmcblk0p12 18812 19072 2080+ 4c Unknown
/dev/block/mmcblk0p13 19072 19712 5120 34 Unknown
/dev/block/mmcblk0p14 19712 19840 1024 36 Unknown
/dev/block/mmcblk0p15 19840 19968 1024 0 Empty
/dev/block/mmcblk0p16 19968 27649 61441 50 Unknown
/dev/block/mmcblk0p17 27649 28672 8190+ 74 Unknown
/dev/block/mmcblk0p18 28673 32768 32768 0 Empty
/dev/block/mmcblk0p19 32769 32896 1022+ 76 Unknown
/dev/block/mmcblk0p20 32896 33408 4096 4a Unknown
/dev/block/mmcblk0p21 33409 33920 4096 4b Unknown
/dev/block/mmcblk0p22 33921 36481 20480 19 Unknown
/dev/block/mmcblk0p23 36481 36481 4 0 Empty
/dev/block/mmcblk0p24 36481 36513 256 23 Unknown
/dev/block/mmcblk0p25 36513 36515 16 0 Empty
/dev/block/mmcblk0p26 36515 36675 1280+ 0 Empty
/dev/block/mmcblk0p27 36675 36683 64 0 Empty
/dev/block/mmcblk0p28 36684 36811 1024 0 Empty
/dev/block/mmcblk0p29 36812 36844 256 0 Empty
/dev/block/mmcblk0p30 36844 40044 25600 83 Linux
/dev/block/mmcblk0p31 40044 49152 72870+ 0 Empty
/dev/block/mmcblk0p32 49153 55936 54270+ 0 Empty
/dev/block/mmcblk0p33 55936 65536 76800+ 77 Unknown
/dev/block/mmcblk0p34 65537 77824 98303 0 Empty
/dev/block/mmcblk0p35 77825 79872 16384 48 Unknown
/dev/block/mmcblk0p36 79873 81920 16383+ 71 Unknown
/dev/block/mmcblk0p37 81921 319488 1900543 83 Linux
/dev/block/mmcblk0p38 319489 401408 655359+ 83 Linux
/dev/block/mmcblk0p39 401409 3809280 27262976 83 Linux
/dev/block/mmcblk0p40 16383 16384 16 5a Unknown
/dev/block/mmcblk0p41 16385 16417 256 73 Unknown
/dev/block/mmcblk0p42 16417 18364 15577+ 5b Unknown
/dev/block/mmcblk0p43 18364 18396 256 5c Unknown
/dev/block/mmcblk0p44 18396 18524 1024 45 Unknown
/dev/block/mmcblk0p45 18524 18556 256 47 Unknown
/dev/block/mmcblk0p46 18556 18812 2048 46 Unknown
/dev/block/mmcblk0p47 18812 19072 2080+ 4c Unknown
/dev/block/mmcblk0p48 19072 19712 5120 34 Unknown
/dev/block/mmcblk0p49 19712 19840 1024 36 Unknown
/dev/block/mmcblk0p50 19840 19968 1024 0 Empty
/dev/block/mmcblk0p51 19968 27649 61441 50 Unknown
/dev/block/mmcblk0p52 27649 28672 8190+ 74 Unknown
/dev/block/mmcblk0p53 28673 32768 32768 0 Empty
/dev/block/mmcblk0p54 32769 32896 1022+ 76 Unknown
/dev/block/mmcblk0p55 32896 33408 4096 4a Unknown
/dev/block/mmcblk0p56 33409 33920 4096 4b Unknown
/dev/block/mmcblk0p57 33921 36481 20480 19 Unknown
/dev/block/mmcblk0p58 36481 36481 4 0 Empty
/dev/block/mmcblk0p59 36481 36513 256 23 Unknown
/dev/block/mmcblk0p60 36513 36515 16 0 Empty

Enjoy :)